Which of the Following Is True of Conversing Informally

Which of the following is true of conversing informally?

A) Talking down to a listener is the best way to command attention when delivering a message.
B) Speaking in a monotone is more likely to hold a listener's interest for long.
C) All people with effective informal talking skills have the same style.
D) The larger a person's vocabulary, the more word choices he or she has.
E) Variation in the speaking speed tends to irritate and disrupt a listener's concentration.