Which of the following are considered "alternative treatments?"

One-year-old Cindy was playing a hiding game with her father. He hid her toy under a blanket and then Cindy would try to find it

Later, he added a second blanket and she watched him hide the toy under it. Interestingly, Cindy still looked under the first blanket. She was _____________. a. engaging in mental representation b. making the A-not-B error c. engaging in deferred imitation d. making an categorization error

According to developmental psychologist K. Warner Schaie, numeric ability tends to increase until the __________, and then stays steady

a) mid-50s, is lower at age 60 b) mid-40s, is lower at age 60 c) mid-30s, is lower at age 60 d) mid-20s, is lower at age 60