Read each sentence to find out whether there is any grammatical mistake error in it. The error if any, will be any part of the sentence. Make the number of that part with error as your answer. If there is 'd) No error', mark.

A. Its stupid to go

B. to the expense of taking

C. music lessons if you never practice

D. No error

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Correct Answer :

B. to the expense of taking

The correct phrase is 'at the expense of doing something'. Hence 'to' should be replaced with 'at'.