I believe the speaker thinks her body is aging. As time goes by, she grows older and older, and her body is not as strong as it used to be when she was young. Her body is frail, in pain, and cannot do the things she was once able to do, which is evident in those lines you wrote above.
Answer:
The answer is probably A, but since I haven't read the articles, nor have any idea what they're about, I can't be completely sure.
Explanation:
N/A