In each of the following questions, a sentence is given with four parts marked (a), (b), (c), and (d). One of these parts may contain an error. Identify the part that contains the error. If the sentence is grammatically correct and free from error, select (e) No error as the answer. The effectiveness of fiscal stimulus (a) depends not merely on its size (b) but also how efficiently (c) it is targeted. (d) No error (e)