In the question given below, a part of the sentence is underlined. Below are given alternatives to the underlined part which may improve the sentence. Choose the correct alternative. In case, no improvement is needed, option (No improvement) is the answer.
Fifty km are not a great distance in these days of fast-moving vehicles.
is not a great distance
is no distance
aren't a great distance
Fifty km is not a great distance in these days of fast-moving vehicles.