Having said farewell to their friends, they _____ for home. [ ]

A. set about            

B. set up            

C. set off            

D. set aside

一方水土，一方文化。我国诞生了昆、京、川、豫、越等剧种。这主要说明（）

A.中华文化源远流长

B.中华文化独树一帜

C.中华文化博大精深

D.民族文化异彩纷呈