I talked for a long time, and in the end I ____ make her believe me. [ ]

A. tried to

B. managed to

C. could

D. succeeded to

烫发中容易出现的问题有：①烫发后的效果与发型设计要求不符；②烫发后头发干枯、起毛。其原因有（）。

A.2种

B.3种

C.4种

D.5种