Answer:
A. to feel intense emotion that makes one feel unwell or nauseous.
Step-by-step explanation:
In the given context, the phrase "feeling sick" is used to convey the narrator's strong emotional response upon learning about the death of the man's wife. The narrator feels empathy and sorrow for the man, to the point of feeling unwell or nauseous due to the intensity of the emotion. Therefore, option A, "to feel intense emotion that makes one feel unwell or nauseous," best captures the contextual meaning of the phrase in this excerpt.