A.worthy adj&n.有价值的,值得...的,做形容词时既可以做表语又可以作定语
①be worthy of +n.
He is worthy of our praise.
②be (quite)worthy of being done (很)值得做...:
The film is worhty of being watched.
③be worthy to be done (很)值得做...,上面的句子可以改写为:
The film is worthy to be watched.
B.worthwhile adj.值得做的..值得出力的,既可以做表语又可以作定语
be worthwhile doing/be worthwhile to do:
It is worthwhile discussing the question again.=It is worthwhile to discuss the question again.
所以选B