Explanation:

This question asks us to convert a sentence from Passive Voice to Active Voice. The original sentence is: 'He recommended that the house should be sold.' **Understanding the Passive Voice Sentence:** * **Main Clause:** 'He recommended' (Active Voice, Simple Past tense). * **Subordinate Clause:** 'that the house should be sold' (Passive Voice, expressing a recommendation or necessity). * The passive construction 'should be sold' implies that 'someone' or 'they' should perform the action of selling. The agent (who should sell) is not explicitly stated in the passive clause, but it is implied that the recommendation is for the action to be taken. **Rules for Converting Passive to Active Voice (especially with 'should be + V3'):** 1. **Identify the Agent:** If the agent is not explicitly stated (e.g., 'by them'), we often use a general pronoun like 'someone' or 'they' as the new subject in the active voice. However, in this specific construction ('recommended that...'), the recommendation itself is the action, and the object of the recommendation can be expressed directly as a gerund or an infinitive phrase, or a 'that' clause with an explicit subject. 2. **Tense:** The main verb 'recommended' is in the Simple Past, so the active voice conversion should maintain this tense. 3. **Structure:** The passive 'should be sold' needs to be converted into an active form that fits with 'recommended'. Common active structures after 'recommend' include: 'recommend + gerund', 'recommend that + subject + base verb', or 'recommend + object + to + infinitive' (less common for 'recommend'). Let's analyze each option: **Option (A): He recommends house to be sell.** * **Tense:** 'recommends' is in the Simple Present tense, but the original sentence uses 'recommended' (Simple Past). This is an incorrect tense shift. * **Grammar:** 'house to be sell' is grammatically incorrect. It should be 'house to be sold' (passive infinitive) or 'selling the house' (gerund). 'Sell' is the base form, not the past participle needed here. Therefore, this option is incorrect. **Option (B): He recommends of selling the house..** * **Tense:** Again, 'recommends' is in the Simple Present tense, which is incorrect. * **Grammar:** 'recommends of selling' is grammatically awkward and incorrect. The verb 'recommend' does not take the preposition 'of' before a gerund. It should be 'recommends selling' or 'recommends that...'. Therefore, this option is incorrect. **Option (C): He recommended selling the house.** * **Tense:** 'recommended' is in the Simple Past tense, matching the original sentence. * **Structure:** 'selling the house' is a gerund phrase that functions as the direct object of 'recommended'. This is a perfectly valid and common active construction after the verb 'recommend'. It effectively conveys the meaning that he advised the action of selling the house. This option is grammatically correct and accurately converts the meaning to active voice. **Option (D): He recommended that sell the house.** * **Tense:** 'recommended' is in the Simple Past, which is correct. * **Grammar:** 'that sell the house' is grammatically incomplete and incorrect. If a 'that' clause is used after 'recommend', it typically requires a subject and a subjunctive verb (e.g., 'He recommended that *they* sell the house' or 'He recommended that the house *be* sold'). Simply 'that sell the house' is not a complete or correct clause. Therefore, this option is incorrect. **Conclusion:** Option (C) correctly converts the sentence to active voice by maintaining the correct tense ('recommended') and using a grammatically sound and common construction ('recommended + gerund phrase'). It clearly and concisely expresses the recommendation in active form. Therefore, option (C) is the correct answer.