Concept:
- A quicker route is to hunt for a rabi crop inside each option, because a single rabi crop is enough to reject the whole set.
- The easiest rabi crops to spot are wheat, gram, peas, barley and mustard.
Step 1: Scan option (A) for a rabi crop.
It contains gram and mustard. Both are winter crops sown after the monsoon withdraws. Option (A) is rejected.
Step 2: Scan option (B).
It contains wheat and peas, the two best known rabi crops of the northern plains. Option (B) is rejected.
Step 3: Scan option (C).
It contains mustard and gram again. Option (C) is rejected.
Step 4: Confirm option (D) by the monsoon test.
Paddy needs standing water and high rainfall, groundnut and soyabean are grown as monsoon oilseeds, and maize is grown in the rainy season in most parts of the country. Not one of them is a winter crop, so the whole set is kharif.
Final Answer: (D) Paddy, Maize, Groundnut, Soyabean