Infants Appear to Be Able to Understand All of These

Infants appear to be able to understand all of these factors in distinguishing between males and females EXCEPT:

A) what it means to be male or female.
B) that female voices go with female faces and male voices go with male faces.
C) that females and males tend to have different hairstyles.
D) that males and females tend to have different vocal pitches.