Sentence Improvement - Verbal and Reasoning

Directions to SolveIn questions given below, a part of the sentence isitalicised and underlined. Below are given alternatives to the italicised part which may improve the sentence. Choose the correct alternative. In case no improvement is needed, option 'D' is the answer.
Q1:

20 kms are not a great distance in these days of fast moving vehicles.

A is not a great distance

B is no distance

C aren't a great distance

D No improvement

ANS:A - is not a great distance

No answer description is available.