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 number of that part is the answer. If there is no error, the answer is (e), No error.
Radhika was very upset (a) / because she had to goes (b) / to a boarding school (c) / so she cried the entire night (d)/  No error (e)