4. Mrs. Kaufman spends a lot of time stroking, cuddling, and rocking her infant son and seems to be highly aware of the baby's actions and needs. Mr. Kaufman worries that his wife's interactions with the baby may eventually lead the child to (a) cry easily when frustrated, (b) fearfully cling to his mother, (c) become unfriendly toward other people, and (d) become withdrawn and uninterested in his surroundings. Describe research on social development that supports or refutes each of the father's concerns.