Read each sentence to find out whether there is any grammatical error in it. The error, if any will be in one part of the sentence. The letter of that part is the answer. If there is no error, the answer is 'E'. (Ignore the errors of punctuation, if any).
Even after requesting him, he did not tell us that how he solved the problem.
Even after requesting
him, he did not
tell us that how
he solved the problem.
No error
Correct answer is C
tell us how