Dr Headstrong Compared Two Textbooks

Dr. Headstrong compared two textbooks. He counted the word "he" 80 times in book A and 20 times in book B. He also found book A contained the word "chairman"
40 times while it only appeared 10 times in book B. He can conclude

A) book A is four-times more sexist than book B.
B) the words "he" and "chairman" appeared four times more often in book A than in book B.
C) students using book A will become more sexist than those using book B.
D) a teacher who chooses book A is more sexist than one who chooses book B.
E) C and D.