Your two-year-old, holly, loves eating gumdrops and you often use them to convince her to behave when you’re running errands. however, today she is definitely not behaving at the grocery store! you hide the gumdrops in your purse, but holly continues to beg you for them and reaches into your purse to try and grab them. holly is displaying which of the following aspects of cognitive development?
a. sensorimotor stage.
b. preoperational stage.
c. concrete operational stage
d. formal operational stage