there were many talented actors out there just waiting to be discoveredto be

there were many talented actors out there just waiting to be discoveredto be
There were many talented actors out there just waiting .
A.to discover
B.to be discovered
C.discovered
D .being discovered .
B.to be discovered 但是这是不定式作什么语
目的状语,"等待"的目的是为了"被发现".......waiting及后面的所有东西整体作伴随状语