1 A: I'd like some information on the Space Museum, please. B: a How can I help you? b There's a special discount for large groups.

Rationale: Speaker A is asking for information. Speaker B's response should be a way to help them. "How can I help you?" is a direct offer of assistance, making it the most appropriate response. "There's a special discount for large groups" is a specific piece of information that might be given later, but not as an initial response to a general information request.

Answer: a How can I help you?