Explanation:

The correct answer is option 'A', which means we carry our school bag on our shoulder. Let's understand why this is the correct answer.

Reasoning:

Carrying a school bag on the shoulder is the most common and practical way for students. Here are a few reasons to support this answer:

1. Comfort: Carrying a school bag on the shoulder is comfortable for students. The weight of the bag is distributed evenly across the shoulder, making it easier to carry.

2. Balance: When a student carries a school bag on their shoulder, it helps maintain their balance while walking or moving around. The bag stays close to the body and does not hinder their movement.

3. Accessibility: Carrying a bag on the shoulder allows students to access their belongings easily. They can quickly reach into their bag to take out books, notebooks, or other items without much effort.

4. Safety: Carrying a bag on the shoulder ensures that the bag does not obstruct the student's vision. It leaves their hands free to hold handrails or grab onto something for support, reducing the risk of accidents.

5. Posture: Carrying a bag on the shoulder promotes good posture. Students can adjust the strap length to ensure the bag is positioned correctly on their back, preventing strain or discomfort.

Conclusion:

In conclusion, carrying a school bag on the shoulder is the most suitable and practical option for students. It provides comfort, balance, accessibility, safety, and promotes good posture. Therefore, option 'A' is the correct answer.