In the following question, out of the four alternatives, select the alternative which will improve the bracketed part of the sentence. In case no improvement is needed, select "no improvement".
A better example is a person who (has been assigned) the duty of planting trees and watering them along an expressway.
(a)have been assigned
(b)have been assign
(c)has been assign
(d)no improvement

Options

A. have been assigned
B. have been assign
C. has been assign
D. no improvement

Answer

D