Jeffery Is 16 Months Old, and His Mother Has Spent

Multiple Choice

Jeffery is 16 months old, and his mother has spent almost every waking moment of the last three weeks trying to toilet-train Jeffery. However, Jeffery has shown no improvement. Jeffery's mother should be told that toilet training as well as other milestones in development are governed by the

A) habituation of the child.
B) child's assimilation pattern.
C) child's readiness.
D) quality and quantity of the training.