Elimination approach:
Step 1: Check Assertion (A) independently. Agricultural marketing efficiency is indeed considered low due to high costs, wastage, and a low farmer share in the final consumer price, so (A) is true.
Step 2: Check Reason (R) independently. The presence of numerous middlemen, wholesalers, commission agents and retailers, between farmer and consumer is a well documented feature of Indian agri markets, so (R) is also true.
Step 3: Test the causal link. Excess intermediaries add their own margin at every stage without adding proportionate value, directly explaining why marketing efficiency is low, so (R) logically explains (A).
This rules out options 2, 3 and 4, leaving option (1) as correct.