A: Can I help you?

Possible answers for B:

• B: Where are the changing rooms?
• B: I'm afraid that's not a good idea.
• B: You should take an aspirin and lie down.
• B: The changing rooms are over there.

The most contextually appropriate answer for "Can I help you?" in a store setting is often a question about location or needs. Therefore, "Where are the changing rooms?" or "The changing rooms are over there." are likely responses. If the customer is feeling unwell, "I'm afraid that's not a good idea." or "You should take an aspirin and lie down." would be inappropriate.