Final answer:
In this scenario, Dr. Trujillo is investigating the element of extinction. Extinction occurs when the conditioned stimulus is presented repeatedly without being paired with the unconditioned stimulus. So, the correct answer is option b.
Step-by-step explanation:
In this scenario, Dr. Trujillo is investigating the element of extinction. Extinction occurs when the conditioned stimulus is presented repeatedly without being paired with the unconditioned stimulus.
It refers to the weakening of a learned association between the neutral stimulus and the unconditioned stimulus. In classical conditioning, extinction is the process by which the conditioned response decreases or fades away. So, the correct answer is option b.