What does the woman want to know when the man feels unwell?

The woman is likely seeking to understand the man's condition better by asking about his problem. This question is broad and invites the man to share specific symptoms or issues he is experiencing, which can be crucial in understanding how to help him or determine the seriousness of his unwellness. By asking "What’s his problem?", she opens the door for him to describe his feelings or symptoms in his own words, which can provide a clearer picture of his situation.

The other options are more specific inquiries that might not encompass the full range of what the man could be experiencing, thereby limiting his response. For instance, asking about the duration of his illness only addresses how long he has felt unwell without getting to the root of his symptoms. Similarly, inquiring specifically about dizziness might overlook other issues he could be facing. Lastly, asking what exactly happened does not necessarily invite further details about his general condition or any other symptoms he may want to discuss.