Explanation:

- The passage describes the agricultural productivity of various regions in India. It highlights areas like Punjab and Coastal Andhra as highly productive and profitable lands due to multiple crops and diverse agricultural activities.

- Fatuous: Silly and pointless. This does not fit the context of productivity.

- Punctilious: Paying great attention to detail or correct behavior. Not relevant to describing land productivity.

- Arbitrary: Based on random choice or personal whim. The passage suggests systematic productivity, not randomness.

- Fecund: Capable of producing an abundance of offspring or new growth; fertile. This matches the description of the land.

- Perilous: Full of danger or risk. The passage focuses on prosperity, not danger.

The correct answer is Option 4: Fecund.