I would say B, as both A and D are obviously incorrect and stress can be a natural part of life as long as it does not dominate you.
Answer:
Short-
1. grogginess
2. fast heartbeat
Long-
1. Increased risk of stroke/heart attack
2. hair loss, eyesight decrease, bad teeth
Explanation:
The backpack's main force that it it is exerting on the body's back and hips is coming from gravity, and can pull the spine downwards. This is why it's important to ear both straps.
