The first story is than the second one.A. difficultB. much difficultC. more difficult D.

问题补充：

The first story is than the second one.

A. difficult

B. much difficult

C. more difficult

D. difficulter

答案：

A. difficult

B. much difficult

(答案→)C. more difficult

D. difficulter

解析：句意：第一个故事比第二个要难的多。句中有than要用比较级，difficult为多音节词，用more构成比较级，故选C.