What best describes a primary reinforcer?

• A. It is a stimulus that must be learned through association.
• B. It is innately rewarding.
• C. It is always a verbal cue.
• D. It is a neutral signal that predicts reinforcement.

Answer: (B)

A primary reinforcer is something a dog inherently finds rewarding because it directly satisfies a biological need. It doesn't require any learning to be valuable—food, water, sleep, warmth, or relief from discomfort are classic examples. This is why the best description is that it is innately rewarding.

If you think about other options, they describe things that do require learning or aren’t inherently rewarding: a stimulus that must be learned through association points to a secondary (conditioned) reinforcer, which gains value through pairing with a primary reinforcer. A verbal cue isn’t itself a reinforcer, and a neutral signal that predicts reinforcement is a conditioned cue that tells the dog reinforcement is coming, not something the dog finds rewarding on its own.