If the onset of a light reliably signals the onset of food, a rat in a skinner box will work to turn on the light. in this case, the light is a reinforcer. a) partial
b) primary
c) negative
d) conditioned
e) delayed

The correct answer is option d) "conditioned".

Explanation:

A conditioned reinforcer is an external stimulus that helps an animal to perform certain activity or develop certain behavior. Conditioned reinforcement requires a learning process, which most likely was necessary in order to make the rat to turn on the light looking for food. Therefore, in this case the light is a conditioned reinforcer.

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