Mark and Jane Have a Six-Month-Old Son

Mark and Jane have a six-month-old son. Most of the time they pick him up right away when he cries, and if you watched them with the baby, you'd see that if he smiles, they immediately smile back. Now that he's babbling a bit, they also "talk back" to him when he makes noises. Psychologists who study family interactions would describe Mark and Jane's behavior as ________.

A) anxious.
B) sympathetic.
C) responsive.
D) thoughtful.
E) overstimulating.