Question

1. infants will often smile when they hear a parents voice. in this situation, the parents voice is considered
2. identify all of the following that are living.

Explanation:

In the context of behavioral psychology, a stimulus is an event or agent that elicits a response. Here, the parent's voice is what triggers the infant's smile (the response). So, the parent's voice fits the definition of a stimulus.

Answer:

A. stimulus