My Niece Is Just Learning to Read

Multiple Choice

My niece is just learning to read. She started by learning her letter sounds, then she sounded out words. Now, she has memorized some simple words and is adding to her list of words that she knows. According to developmental psychologists, my niece's learning to read reflects

A) a quantitatively critical phase of development
B) stages of reading development
C) a genetic developmental change
D) a continuous developmental change