In Consent, Capacity Differs from Comprehension Insofar As

In consent, capacity differs from comprehension insofar as:

A) Capacity is the willingness of the client to be tested, but comprehension is the ability to understand test items
B) Capacity is the general ability of the client to understand what is happening in treatment and to give consent and comprehension is the ability to understand the items on the test
C) Capacity is the ability of the client to answer the questions on the instrument honestly and comprehension is the ability to understand test items.
D) None of the above