Amy and George were practicing a song for a cultural program. Their music teacher insisted that Amy ...

Amy and George were practicing a song for a cultural program. Their music teacher insisted that Amy sing the verses in a high pitch. Which of the following could be a reason for the music teacher's decision to select Amy for the high pitch sounds and not George?
 
  A) A woman's vocal cords are usually shorter and vibrate at a greater frequency.
  B) The pitch of a man's voice is usually too high to resonate.
  C) A man's vocal cords are shorter and therefore vibrate at a lower frequency.
  D) The pitch of women's voices is usually lower than that of men's voices.