Explanation:

This question presents a conditional sentence and asks us to complete the main clause with the correct verb form. The structure of the 'if' clause ('If I had won the match') is crucial for determining the correct form in the main clause. **Understanding Conditional Sentences:** This sentence is an example of a **Third Conditional** (also known as Conditional Type 3). The Third Conditional is used to talk about hypothetical situations in the past and their hypothetical results in the past. It describes what *would have happened* if something *different had happened*. **Structure of the Third Conditional:** * **If-clause:** If + Past Perfect (had + past participle) * **Main clause:** Would have + Past Participle (V3) Let's apply this structure to the given sentence: **Given If-clause:** 'If I had won the match' (This is in Past Perfect tense: 'had' + 'won' (past participle of 'win')). Now let's evaluate each option for the main clause 'I ................. you a grand party': **Option (A): had given** This option uses the Past Perfect tense ('had' + 'given'). If both clauses were in the Past Perfect, it would create an incorrect conditional structure (e.g., 'If I had won, I had given'). The main clause of a Third Conditional requires 'would have' + past participle, not just 'had' + past participle. Therefore, this option is incorrect. **Option (B): will have given** This option uses the Future Perfect tense ('will have' + 'given'). The Future Perfect tense describes an action that will be completed by a certain point in the future. This tense is completely inappropriate for a Third Conditional sentence, which deals with hypothetical past events and their past consequences. Therefore, this option is incorrect. **Option (C): would have given** This option correctly follows the structure of the main clause for a Third Conditional sentence ('would have' + 'given' (past participle of 'give')). It accurately expresses the hypothetical past result of the hypothetical past condition. 'If I had won the match, I would have given you a grand party' means that because I didn't win, I didn't give a party. This is the correct form. **Option (D): would given** This option is grammatically incorrect. While it uses 'would', it is missing the auxiliary verb 'have' before the past participle 'given'. The correct structure is 'would have + past participle'. Therefore, this option is incorrect. **Conclusion:** To complete a Third Conditional sentence where the 'if' clause is in the Past Perfect, the main clause must use 'would have' followed by the past participle. Option (C) correctly applies this rule. Therefore, option (C) is the correct answer.