Read the excerpt below and answer the question.
...it is certainly a subject, even for its nobleness, worth our labour to inquire into…to inquire into the original, certainty, and extent of HUMAN KNOWLEDGE, together with the grounds and degrees of BELIEF, OPINION, and ASSENT; ("An Essay Concerning Human Understanding")
An implicit meaning of the excerpt is that Locke thinks the study of how humans attain knowledge is ____________.
A.) not worth the time and effort it requires
B.) indistinguishable from belief, opinion, and assent
C.) forbidden knowledge
D.) a difficult, but worthy endeavor