Final answer:
The correct answer is 'h) plentiful/abundant.' 'Plentiful' describes last year's successful crop yield, while 'abundant' describes the current high number of pests.
Step-by-step explanation:
Last year, the crop was plentiful, but this year, the pests are abundant. This sentence is a comparison between two different years concerning crop yield and pest populations. Plentiful refers to a large amount or supply, which indicates a successful harvest in the past year. Abundant means existing in large numbers, which describes a current problem with pests affecting this year's crop. The severity and vulnerability of farming can be seen through history where heavy rains, drought, and pests have repeatedly caused crop failure, leading to food shortages and economic troubles for farmers.