With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.

A. whether          B. what             C. that         D. how

With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity

1. A.
   whether
2. B.
   what
3. C.
   that
4. D.
   how

With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.

A. whether          B. what             C. that         D. how

With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.

A. whether　　　 B. what　　　　　　 C. that　　　　　 D. how

With Halloween approaching, there exists a real concern among parents and teachers __________ trick or treating will become a seriously anti-social activity.