Read The Passage And Answer The Question: For all the modes of thinking of which we are conscious may be referred to two general classes, the one of which is the perception or operation of the understanding, and the other the volition or operation of the will. Thus, to perceive by the senses (sentire), to imagine, and to conceive things purely intelligible, are only different modes of perceiving (percip iendi); but to desire, to be averse from, to affirm, to deny, to doubt, are different modes of willing.

Which set of word clues best helps the reader decide which kind of writing is used in this question?
A. Two general classes, the one of which is the perception or operation of the understanding

B. For all the modes of thinking

C. Different modes of willing