Read the sentence below to find out whether there is any grammatical error in it. The error, if any, will be in one part of the sentence. Choose the option with that part as your answer. If there is no error, choose 'D' as your answer. (Ignore the errors of punctuation, if any).
Sixty miles are a good distance.
Sixty miles
are
a good distance.
No error.
Correct answer is B
Sixty miles is a good distance.