Introduction:
In the story "Taro's Reward," Taro is a young boy who is known for his honesty and hard work. When Taro's father accidentally drops his purse with a hundred pieces of gold, Taro finds it and returns it to him. In return for his honesty, his father gives him one gold coin, which Taro decides to use to help the poor and needy.

The villagers:
The correct answer to the question is option 'B' - The villagers. Taro's act of returning the lost purse to his father and using the reward to help others creates a positive impression among the villagers. They see Taro as a kind-hearted and selfless person who always thinks of others before himself. However, when Taro's father drops his purse again, this time intentionally, Taro's brothers decide to keep the money for themselves. They convince Taro that their father has tricked them by intentionally dropping the purse to test their honesty. Taro, being the innocent and trusting person he is, believes his brothers and feels that his father has indeed tricked them.

Taro's friends:
Taro's friends are not directly involved in the situation of the dropped purse. They are not aware of what happened or the actions of Taro's brothers. Therefore, it can be concluded that Taro's friends did not feel tricked by Taro or anyone else.

His parents:
Taro's parents are not the ones who feel tricked in this situation. Taro's father intentionally drops the purse to test his sons' honesty, but he does not feel tricked himself. Taro's mother is not directly involved in this particular incident, so she does not feel tricked either.

His brothers:
Taro's brothers are the ones who actually trick Taro into believing that their father deliberately dropped the purse to test them. They manipulate Taro's trusting nature and convince him that their father has deceived them. Taro, being innocent and easily influenced, feels that his brothers have tricked him.

Conclusion:
In summary, the correct answer to the question is option 'B' - The villagers. Taro's friends, parents, and brothers are not the ones who feel tricked. It is the villagers who had a positive image of Taro and believed in his honesty. However, the actions of Taro's brothers led him to believe that their father had tricked them, causing the villagers to feel deceived by Taro's apparent dishonesty.