Every day when she gets home, Mrs. Sweet has to take insulin injections, which frighten her. It has become so bad that she now gets frightened when she sees her house. According to classical conditioning, the injection is a(n):

A. Unconditioned Response
B. Unconditioned Stimulus
C. Conditioned Response
D. Conditioned Stimulus

In classical conditioning, the unconditioned stimulus, unconditioned response, and conditioned stimulus play key roles in eliciting and shaping responses.

Explanation:

In classical conditioning, the unconditioned stimulus (US) is the stimulus that elicits a response before conditioning occurs. The unconditioned response (UR) is the naturally occurring response that follows the unconditioned stimulus. The conditioned stimulus (CS) is a neutral stimulus that, after being repeatedly presented prior to the unconditioned stimulus, evokes a similar response as the unconditioned stimulus.

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