Answer:
B.conditioned stimulus;
C.unconditioned stimulus.
Step-by-step explanation:
A famous experiment known as the "Little Albert" was performed by John B. Watson and Rosalie Rayner. They performed the experiment on a 9 months old child, whom they named Albert. The child was then exposed to rabbits, rats, monkeys, etc. They divided the emotional response into five conditions.
The white rat in this experiment is conditioned stimulus. The conditioned stimulus is the stimulus that produces conditioned response when associated with unconditioned stimulus.
The loud noise in the experiment is the unconditioned stimulus. The unconditioned stimulus is the stimulus that produces a sudden response without any prior learning.