Which of the following is an example of 'Grandma's Law'?

'Grandma's Law' refers to a common behavioral principle often described in parent-child interactions, where a child must complete a less desirable activity before being allowed to engage in a more desirable one. This concept creates a structured incentive that encourages compliance with tasks that may not be inherently rewarding.

The first option illustrates this concept effectively: getting a snack for finishing homework demonstrates a clear order of operations. The less desirable task (homework) must be completed before the desirable reward (snack) is provided. This mirrors the essence of 'Grandma's Law,' as the reward acts as motivation to encourage the child to complete their homework.

The other options fail to exemplify 'Grandma's Law' as they do not establish a direct link between a less enjoyable task and a subsequent reward. For instance, attendance rewarded with prizes does not necessarily involve completing a non-preferred task first; reading books for extra credit does not impose a specific prerequisite based on the desire for a reward; and taking breaks after every task does not correlate with the completion of a less desirable activity for the sake of an immediate reward. Each of these options deviates from the conditional structure that defines 'Grandma's Law.'