DIRECTIONS: in the following question, a part of sentence is bold. Below are given alternatives to the bold part which may improve the sentence. Choose the correct alternative. In case no improvement is required, choose “No Improvement” option.
We could not help admire his inventive genius.

Options

A. A) could not help to
B. B) No Improvement
C. C) could not but
D. D) could not help but

Answer

D

Explanation

Here. contrast is evident. Hence. could not help but is the right usage.
But is used to introduce a word or phrase that contrasts with what was said before.
•His mother won.t be there, but his father might.