The correct answer is: B. annoyed.
Chagrin is a feeling of deep disappointment or embarrassment. It is often caused by a mistake or failure. When someone is chagrined, they may feel ashamed, humiliated, or embarrassed. They may also feel angry, frustrated, or resentful.
In the given sentence, the uncle is so chagrined that he avoids mentioning the incident. This suggests that he is ashamed or embarrassed about what happened. He may also be angry or frustrated with himself for making a mistake.
The other options are incorrect because they do not accurately describe the uncle’s feelings. Pleased, happy, and tired are all positive emotions, while annoyed is a negative emotion. The uncle is not pleased, happy, or tired about the incident. He is annoyed.
I hope this explanation is helpful. Please let me know if you have any other questions.