Thanks for sharing, super helpful to be prepared for such a question. I think you did the right thing. I would reply that I only applied to places that I believed were a great fit so the possibility remains high. I don't believe that seems rude or undecided, if you have offers from multiple institutions and they are of equal fit to you then naturally a visitation experience and final funding offer would help you make a final decision. You should be proud that you have multiple offers and be willing to find what will be best for you to achieve your objective. I think it would only be rude to hold up an offer if you did not have the intention to go at all.