Ever Since She Saw a Snake Eat a Mouse at the Reptile

Multiple Choice

Ever since she saw a snake eat a mouse at the reptile exhibit at the zoo,Jin has been terrified of snakes.Now Jin's class has a pet snake and her teacher wants to help reduce Jin's fear.
The teacher begins by only uncovering the snake aquarium when Jin and her classmates are
Eating snack.This attempt at associating the snake with something positive is called

A) systematic desensitization.
B) stimulus discrimination.
C) counterconditioning.
D) second-order conditioning.