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).
Mohan has collected all the necessary documents and have written a good paper for this conference.
Mohan has collected
all the necessary documents
and have written a good paper
for this conference.
No error
Correct answer is C
and has written a good paper