The arms control treaty will be ratified only insofar as it is verifiable.

A. only insofar as it is verifiable
B. insofar as the provisions are verified
C. only if the provisions it contains may be verifiable
D. only if compliance to its provisions can be verified
E. exclusively if its contained provisions are verifiable

OA is D
I narrowed the answer down to A , B and D what is the perfect answer here. An Expert contribution is needed. Thanks