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
My best guess would be A. B is the second best answer. C and D don't seem to be very good answers. How many attempts do you have at this question?
What summary? Sorry I’m just trying to help but I’m confused
