Kelsey just told her family a really funny joke that she made up herself. In order to use a primary reinforcer to encourage her in her joke-telling, Kelsey's dad might ________.

A) offer her money
B) applaud her appropriate behavior
C) offer her praise for a job well done
D) offer her a piece of candy

Primary reinforcers are naturally reinforcing, meaning they satisfy a basic need or are inherently desirable. Offering Kelsey a piece of candy is an example of a primary reinforcer because it satisfies a basic need for nourishment (or in this case, the desire for a sweet treat), unlike the other options which are considered secondary reinforcers because they rely on their association with primary reinforcers or are valued for social or psychological reasons.