What Findings Have Led Some Researchers to Question That There

What findings have led some researchers to question that there are large gender-related differences in nurturing?

A) Although girls gain and boys lose interest in babies throughout childhood, boys continue to nurture their pets.
B) Both boys and girls gain interest in caring for infants until late childhood, when girls' interest increases sharply.
C) Recent studies have shown few gender-related differences in nurturing.
D) When number of siblings is taken into consideration, no gender differences appear in nurturing.