Research Involving the "Strange Situation" Stress Test Reveals That

Research involving the "Strange Situation" stress test reveals that

A) most infants are happy when their mothers leave and are upset when they return.
B) most infants are upset when their mothers leave and are happy when they return.
C) most infants are not upset when their mothers leave because they believe that she will return shortly.
D) most infants are upset when their mothers leave and when they return because they feel neglected.