In this question, a sentence has been divided into four parts (A), (B), (C) and (D). Read the sentence to find out whether there is any grammatical error in it. The error if any, will be in one part of the sentence. Mark that part as your answer. If there is no error, the answer is ‘No error’. Ignore the error of punctuation if any.

The chairman of the board, who was very sorry to learn (A)/ that he’d acted on incorrect information, should not be held responsible (B)/ for decreasing revenues or falling stock prices; (C)/ though many have suggested he shall. (D)