Charlotte's Parents Want to Facilitate Their 12-Month-Old Daughter's Ability to Communicate

Charlotte's parents want to facilitate their 12-month-old daughter's ability to communicate with them. They can do this, at least in the short term, by

A) using adult-directed speech whenever they speak to her
B) discouraging her from using gestural communication, since it may interfere with the development of spoken language
C) speaking to her less often
D) accompanying their spoken words with symbolic gestures that they use consistently