Step 1: Understanding the Concept:
Market intermediaries perform essential physical and facilitating marketing functions in agricultural mandis.
Step 2: Detailed Explanation:
Matching middlemen with their primary functions:
1. Hamals (A) $\to$ Job of loading and unloading produce in the market yard (II).
2. Commission agents Kaccha arhtiyas (B) $\to$ Takes over physical handling of produce and arranges for sale on commission (IV).
3. Merchant middlemen Wholesalers (C) $\to$ Buy and sell agricultural commodities on their own account, taking title and price risk (I).
4. Brokers Dalals (D) $\to$ Brings together buyer and seller on the same platform for negotiation without handling goods (III).
Step 3: Final Answer:
Matching summary: A $\to$ II, B $\to$ IV, C $\to$ I, D $\to$ III.