When Do Children First Show Evidence of Metamemory

When do children first show evidence of metamemory?

A) in infancy, as soon as they show habituation to familiar stimuli
B) during the preschool years, when they understand that some things are easier than others to remember
C) in grade school, when they recognize that rehearsal aids recall
D) once they reach preadolescence, when they recognize that organization is more effective than rehearsal