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).
Foolishly John opened the cooker when it was full steam and burnt his hands.
Foolishly John opened
the cooker when
it was full steam
and burnt his hands.
No error
Correct answer is C
it was still steaming