In the given question you will find sentence, part of which are `"bold"`. compare the `"bold"` part of each sentence with the expressions (a),(b) and (c) given below. choose the expression which is an improvement upon the `"bold"` part. If none of the three expressions improves the sentence,then your answer is (d).
Within the last few years most of the fertile land `"had undergone"` indigo cultivation.

Options

A. had underwent
B. has undergone
C. was undergone
D. no improvement

Answer

D