Answer: Insecure attachment
Explanation: Sandra's action according to Mary Ainsworth could best be described as insecure attachment. Sandra who was supposed to be happy or obsessed by the toys found in the pediatrician's waiting room clinged to her mother, this shows that the bond or relationship with her present environment has been likely contaminated or impeded by fear. This could be due to past or previous experiences. This shows that Sandra isn't comfortable with the environment and has become apprehensive and probably develops negative thought.