In a Study by Lemmon and Moore (2007),3-Year-Olds Preferred to Earn

In a study by Lemmon and Moore (2007) ,3-year-olds preferred to earn one sticker immediately instead of receiving five stickers later.However,4-year-olds were willing to wait to earn four or five stickers.This study demonstrated that 4-year-olds,but not 3-year-olds have the ability to

A) give in to temptation.
B) delay gratification.
C) be morally relativistic.
D) make moral decisions based on abstract principles.