Point at which the child lost his parents at the fair:

There are various points at which the child could have lost his parents at the fair. However, the most probable points are discussed below:

1. Sweetmeat-shop:
The child might have lost his parents at the sweetmeat-shop. Children have a sweet tooth, and they are often attracted to sweets. The child might have seen something he liked at the sweetmeat-shop and might have gone to buy it with his parents' consent. However, he might have got lost in the crowd while returning from the shop.

2. Flower-shop:
Another point at which the child might have lost his parents is the flower-shop. Children are fascinated by colorful things, and flowers are no exception. The child might have seen some beautiful flowers at the shop and might have gone to take a closer look. However, he might have lost his parents while doing so.

3. Balloon-sellers:
Balloon-sellers are a common sight at fairs, and children are often attracted to them. The child might have seen some colorful balloons and might have gone to buy them with his parents. However, he might have got lost in the crowd while returning from the shop.

4. Roundabout:
The roundabout is a popular ride at fairs, and children love it. The child might have gone with his parents on the ride, but he might have got lost in the crowd while getting off.

Conclusion:
In conclusion, it is difficult to determine the exact point at which the child lost his parents at the fair. However, the above-mentioned points are the most probable ones. It is important for parents to keep a close eye on their children at fairs to prevent such incidents from happening.

Iv)At the roundabout