Read the sentence from paragraph 4. Other people discovered uses for
charcoal in chemistry and medicine,
and artists used it as pigment in
colorful paints.

Why does the author choose to end the passage
with this sentence?

A. to highlight the various uses for charcoal
B. to emphasize the use of charcoal in art work
C. to promote the career fields charcoal is used
D. to encourage more practical uses of charcoal