Below a sentence is given which is divided into 4 segments. Identify the segment of the sentence which contains the grammatical error. If there is no error, mark 'No error' as your answer.

Researching various subjects were made easy, as a variety of journals (A) on the subject were available in the (B) local markets of Mumbai. It was difficult to figure (C) out the defects that would serve as the basis of the dissertation. (D)