Step 1: Match Primitive Subsistence Farming.
This old style of farming, done with simple tools, is best known through slash and burn cultivation, so I links to (c).
Step 2: Match Intensive Subsistence Farming.
Where land is scarce and labour is plentiful, farmers work the same plot intensively by hand, matching II to (d), labour intensive cultivation.
Step 3: Match Commercial and Plantation Farming.
Commercial farming leans on machines and modern inputs with less manpower, matching III to (a), while plantation farming grows one crop over a large area, matching IV to (b).
Step 4: Conclude.
Putting these together gives I-c, II-d, III-a, IV-b. The correct answer is option (C).