Which of the Following Students Provides the Most Accurate Information

Which of the following students provides the most accurate information about the variability found in the way we pronounce pronouns?

A) Melissa: "Aside from the pitch of a person's voice, phoneme pronunciation is relatively uniform."
B) Nico: "The variability in pronunciation is so great that we frequently have trouble comprehending a spoken sentence."
C) Annabelle: "Despite the great variability in pronunciation, we perceive speech quite accurately."
D) Alan: "Fortunately, coarticulation is a helpful part of our speech perception, and it compensates for the fact that people's speech shows great variability."