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
This one is confusing because OA lists something which haven't been included in the original sentence.
Can we expect these types of questions where you have to have a background knowledge about the context?