Select the most appropriate option to improve the underlined segment in the given sentence. If there is no need to improve it, select No improvement. I don't understand why did you not call me last night

Options

A. why had you not call
B. why you did not call
C. why not did you call
D. No Improvement

Answer

B

Explanation

Sub. is used before the (V.) Hence, why you did not call is the right usage