💡 Detailed Explanation
The speaker is hesitating to ask a favor, feeling that he doesn't have the right to do so ('頼む筋合いじゃない'). The most natural response is to encourage him and show you don't mind, like 'Don't be so distant. Please, tell me anything.' ('水臭いですよ。何でも言ってください。'). Option 1 agrees with him and shuts down the conversation. Option 3 incorrectly assumes a formal, rule-based refusal is appropriate.