Step 1: Pair primitive and intensive subsistence farming.
Primitive subsistence farming uses simple tools like hoes and digging sticks and includes slash and burn cultivation, so I matches with (c). Intensive subsistence farming is practiced on small plots with a lot of manual labour to get high yield, so II matches with (d).
Step 2: Pair commercial and plantation farming.
Commercial farming relies on machinery and modern inputs and needs less manual labour, so III matches with (a). Plantation farming grows one single crop like tea or coffee over a large area, so IV matches with (b).
Step 3: Put the full match together.
That gives I to c, II to d, III to a, and IV to b.
Checking the options, this matches option (C), which is the correct answer.