Four-Year-Old Becky Has Just Hit Her Sister Again

Four-year-old Becky has just hit her sister again. According to most developmental psychologists, Becky's mother should

A) spank Becky; she is too young to understand reasoning.
B) explain to Becky that "hitting hurts"; she is old enough to understand the consequences of her behavior for others.
C) send Becky to bed without dinner; she is too young to understand reasoning.
D) spank Becky; she is old enough to understand the consequences of her behavior and would expect to be punished accordingly.