The ability of both an infant and his or her caregiver to respond appropriately and sensitively to each other's mental and emotional states is known as mutual

A) deregulation.
B) agreement.
C) acceptance.
D) regulation.

The term that best describes the ability of an infant and his or her caregiver to respond appropriately and sensitively to each other's mental and emotional states is mutual regulation. Mutual regulation involves the ability of the caregiver and infant to modulate their emotional states in response to one another, helping to maintain emotional stability and a sense of security for the infant. This term differs from the other options provided, as mutual deregulation, mutual agreement, and mutual acceptance do not accurately capture this concept.