Adult Male Humans Generally Have Deeper Voices Than Do Adult

Adult male humans generally have deeper voices than do adult female humans, as the direct result of higher levels of testosterone causing growth of the larynx.
-Which addition to the information in the paragraph above would make more than one of the answers listed in the previous question correct?

A) If larynx size was also affected by the amount the larynx was used (i.e., the amount of vocalization) .
B) If males prefer to mate with females possessing higher voices.
C) If females killed female offspring whose voices were too deep.
D) If the trend described above was seen in the fossil record of only one species of ape.