[求助]PrepII-25依然是比较对象对等的老大难问题

25. There is a widespread belief in the United States and Western Europe that young people have a smaller commitment to work and a career than their parents and grandparents and that the source of the change lies in the collapse of the "work ethic."

(A) a smaller commitment to work and a career than their parents and grandparents

(B) less of a commitment to work and a career than their parents and grandparents

(C) a smaller commitment to work and a career than that of their parents and grandparents

(D) less of a commitment to work and a career than their parents and grandparents had

(E) a lessening of the commitment to work and a career that their parents and grandparents had

D is correct.

Prep笔记上说C的问题是前后比较对象有问题，我觉得奇怪，比较词是smaller，说明修饰和比较的的确是commitment，那后文的that有什么问题么？

跪谢各位的帮忙了

对哦，C选项还原之后类似于I have a bigger apple than that of you. 豁然开朗