Eli's grandma gives him a Tootsie roll every time she visits. When Eli sees his grandma arriving, his mouth begins to water. In this example, the conditioned stimulus (CS) is .

grandma

Explanation: In classical conditioning, the conditioned stimulus is a previously neutral stimulus that, after becoming associated with the unconditioned stimulus, eventually comes to trigger a conditioned response. However, In this scenario given, Eli's grandma gives him a Tootsie roll every time she visits. When Eli sees his grandma arriving, his mouth begins to water. In this example, the conditioned stimulus is grandma.

speed

explanation: