Introduction:
The question asks about the location where the balloon man stands. The correct answer is option 'A', which states that the balloon man stands at the market square.

Explanation:
The market square is a common gathering place in many towns and cities. It is usually a central location where people come to buy and sell goods, meet friends, and enjoy various activities. Let's discuss why the correct answer is option 'A'.

Market Square:
- The market square is a bustling place where people come to buy groceries, clothes, toys, and other items.
- It is a vibrant and lively area with many stalls and shops.
- The balloon man chooses to stand at the market square because it allows him to be in the midst of a large crowd.

Reasons for Choosing the Market Square:
1. Visibility: The market square is a highly visible location. It attracts a large number of people due to the various shops and activities taking place there. By standing at the market square, the balloon man can easily catch the attention of passersby.

2. Potential Customers: The market square is frequented by people from all walks of life, including families with children. This makes it an ideal location for the balloon man as children are often fascinated by balloons and would be potential customers.

3. Competition: By standing at the market square, the balloon man can benefit from the lack of competition in that area. While there may be other balloon sellers, the market square offers a larger customer base and potential for more sales.

4. Convenience: The market square is a central location that is easily accessible for both locals and visitors. It is likely to have good infrastructure, such as parking facilities and public transportation, making it convenient for people to visit.

5. Atmosphere: The market square is known for its vibrant atmosphere, filled with the sounds of people chatting, music playing, and various activities happening around. This lively environment adds to the overall experience of buying balloons and creates a positive association with the balloon man's business.

Conclusion:
In conclusion, the balloon man stands at the market square because it provides visibility, access to potential customers, limited competition, convenience, and a lively atmosphere. Standing at the market square allows the balloon man to maximize his sales and create a successful business.

D) at the market square