Answer:
Chronic stress accelerates premature aging by shortening DNA telomeres. Each chromosome is like a DNA library with two protective caps on the end known as telomeres. As telomeres become shorter their structural integrity weakens, which causes cells to age faster and die younger.
Explanation
We are given with a statement given above. The answer is D since there is no erratum involved in the sentence. Children is already plural hence placed after n. Monkey bars and swings are not in the state of owning something so there should not be any apostrophe placed.
C because "their" is possessive.
I think it's B, but I can't guarantee it... Sorry
