单选题 It is believed that today's pop music can serve as a creative force ______ stimulating the thinking of its listeners.
A. by B. with C. at D. on

【正确答案】 A

【答案解析】[解析] 介词by常和动名词连用，说明方式、手段等。如：He taught himself to play the violin by practising all night. 他通过晚上整夜地练习，自学拉小提琴。Children can learn a lot by watching TV. 孩子们可以通过看电视学到好多东西。