The sentence "To her __________, she forgot her boss's name during the meeting" describes a situation where the person experienced a strong negative emotion due to an embarrassing or humiliating incident. The correct answer, "chagrin," precisely captures this feeling. "Chagrin" refers to distress or embarrassment at having failed or been humiliated. Forgetting one's boss's name in a meeting would undoubtedly cause a significant amount of embarrassment and mortification, making "chagrin" the most fitting choice.
Let's consider why the other options are unsuitable:
- Pride: This refers to a feeling of deep pleasure or satisfaction derived from one's own achievements, or the achievements of those with whom one is closely associated. Forgetting a boss's name would certainly not evoke pride.
- Delight: This means great pleasure. There would be no pleasure in such an embarrassing oversight.
- Relief: This is a feeling of reassurance and relaxation following release from anxiety or distress. While one might feel relief after the meeting is over, the immediate emotion upon forgetting the name would not be relief.
Thus, "chagrin" accurately conveys the sense of acute embarrassment and vexation that would accompany such a social gaffe, making it the ideal word to complete the sentence and describe her emotional state.