use the excerpt to answer the question.

Good sleep hygiene, the behaviors that promote good sleep, will help ensure that middle schoolers get enough sleep.

how does the author develop the key concept in this sentence?

by defining an important term

by giving an example

by comparing important ideas

by describing specific steps to solve a problem

The author develops the key concept in this sentence by defining an important term. The important term being defined is "good sleep hygiene," and it is explained as "the behaviors that promote good sleep." This definition helps explain the concept that these behaviors are important for ensuring that middle schoolers get enough sleep.