Which of the Following Is the Best Example of What

Multiple Choice

Which of the following is the best example of what is meant by the term maturation?

A) a first-grader who is learning to do arithmetic problems
B) an infant who babbles "ga-ga-ga-ga" when she is content
C) a college student who is working hard to learn to speak Spanish
D) a mother who teaches her 2-year-old to control his temper by ignoring him when he has a tantrum