题目

Simon was a curious(好奇的）boy. He lived with his grandfather. One night, he secretly entered the store room where his grandfather kept his priceless antiques (古董). Simon stood on a chair. He lifted the box where his grandfather had kept many wrist—watches. While getting down from the chair, the box slipped out of his hands and fell onto the floor. To his shock, he found the glass of his grandfather's favorite watch broken. Simon got frightened. He picked up the pieces of glass. He put the broken watch back into the box and placed the box back on the shelf. He could not sleep that n已知函数在定义域上的导函数为，若函数没有零点，且，当在上与在上的单调性相同时，则实数的取值范围是（ ）A. B. C. D.