Explanation:

The word 'राखर्च' (Rakharch) means 'खर्च राह के लिए' (kharch rah ke liye), which translates to 'expenditure for the road' or 'travel expenses'. In this compound, the second word ('खर्च' - expenditure) is dominant, and there is a hidden postposition ('के लिए' - for) between the two words. This structure is characteristic of 'तत्पुरुष समास' (Tatpurush Samas), specifically 'संप्रदान तत्पुरुष' (Sampradan Tatpurush), where the compound denotes the purpose for which something is done. Options (1) 'कर्मधारय' (Karmadharaya) involves a descriptive relationship, (3) 'बहुब्रीहि' (Bahuvrihi) refers to a third meaning, and (4) 'अव्ययीभाव' (Avyayibhav) has the first part as an indeclinable adverb, none of which apply here.