Verbal Ability (Mixed Test)

Directions: In the following sentence some parts have been underlined and labelled A, B, C and D. Identify the part that contains an error. If there is no error in any part of the sentence, mark your answer as E.

My pen is (A) as good, if not (B) better, than your's; (C) that's why it (D) writes so beautifully. (E) No error