Possible answer:

Driver stopped narrator from buying strawberries from the two boys because he thought it was not safe and the boys might cheat them. The following are the details that support this explanation:

Safety concerns
- The driver warned the narrator that the boys might be thieves or robbers who could harm them or steal their money or belongings.
- The driver mentioned that the area was notorious for criminal activities and that they should not trust strangers, especially young boys who were not accompanied by adults.
- The driver suggested that they should buy fruits from a reputable store or market where they could ensure the quality and hygiene of the products.

Possible cheating
- The driver also suspected that the boys might cheat them by giving them rotten or spoiled fruits, or by charging them more than the fair price.
- The driver argued that the boys were not trained or certified to sell fruits, and that they might not have followed the proper procedures for washing, sorting, and packing the fruits.
- The driver cautioned the narrator that buying fruits from unlicensed or unregulated vendors could lead to health risks, such as food poisoning, allergies, or infections.

Narrator's dilemma
- The narrator was initially tempted to buy the strawberries from the boys, as she was fond of them and had tasted them before.
- The narrator was also moved by the boys' plight, as they seemed poor and in need of money to support their family or education.
- The narrator was torn between her desire to help the boys and her fear of being scammed or robbed, as well as her respect for the driver's authority and experience.

Resolution
- The narrator eventually decided not to buy the strawberries from the boys, as she realized that the risks outweighed the benefits.
- The narrator thanked the driver for his advice and apologized to the boys for not buying from them, but explained that she had to follow the rules and ensure her safety and health.
- The narrator learned a valuable lesson about the importance of being cautious and responsible when dealing with strangers, especially in unfamiliar or risky situations.