Whenever Two-Year-Old Abby Uses the Toilet,her Mom Puts a Sticker

Multiple Choice

Whenever two-year-old Abby uses the toilet,her mom puts a sticker on a chart.When the sticker chart is full,Abby is allowed to pick out a toy from the store.Using the sticker as a
Secondary reinforcer means that this is a type of

A) variable interval schedule.
B) dopamine activity.
C) token economy.
D) insight learning.