I think B is the answer im not for sure though
Answer:
biology
Explanation: But physics is good too
Strength training is a great way to help increase the strength of bones and help you age better. It can reduce fractures from occurring, lets your joints stay flexible, allows you to be able to consume more foods in your diet, boosts your immune system, and is a great way to burn calories. Strength training might affect someones everyday appearance by making them age more gracefully, and can help with staying in shape, preventing bone and mass loss, and helps with keeping good posture. How strength training affects ones self-esteem is that, it enlightens their mood, increases self confidence, and puts you at a healthier mindset.
B. Sleep Disorders because thats mental