Answer:
<h2>B. improve their performance</h2>
Explanation:
Endocrine deficiencies refers to an endocrine disoder which slows the growth of children.
Now, Human Growth Hormone can help children to supplement the endocrine disorder. However, athletes often use HGH to increa the body mass and their performance, specifically, to recover faster from muscle fatigue.
Therefore, the right answer is B.
