Which of the Following Appears to Be Most Influential on Changes

Multiple Choice

Which of the following appears to be most influential on changes that occur over time In the gender distribution in the stuttering population from 2:1 to approximately 4:1 male-to-female ratio:

A) the percent of natural recovery among girls is larger than for boys
B) boys are physically stronger than girls
C) gender differences in various fine motor control
D) gender differences in phonology and language skills