"What did you do last year—what use did you make of the time as it went by? What did you do yesterday? What are you going to do today? You possess a mind organized for practically unlimited thinking and studying. How many of your hours do you live as a thinking, studying man? How many do you live on a par with an ox chewing his cud in the field?" Why does the author ask a series of rhetorical questions in paragraph 11?

A.
to point out the similarities between animals and human beings

B.
to encourage readers to think about the meaning of time

C.
to suggest specific ways to utilize time most wisely

D.
to make readers evaluate their use of time