Pushing Infants Beyond Their Current Capacities with Letter and Number

Pushing infants beyond their current capacities with letter and number flash cards and educational tablet applications __________.

A) yields smarter "superbabies" who are ready for the challenge of formal education
B) increases the size of the prefrontal cortex, which governs complex cognition
C) increases the brain's capacity for impulse control and stress management
D) can cause them to withdraw, thereby threatening their interest in learning