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).
He managed to make sense of the book even though it was the first time he read anything on the subject.
He managed to make sense of the book
even though it was the first time
he read anything on the subject.
No error.
Correct answer is C
when he read anything on the subject