What is the best conjunction word to join or glue the next sentences? :

Do you like the chocolate ice cream? Do you prefer the banana split with strawberries in it?
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A. Do you like the chocolate ice cream, but do you prefer the banana split with strawberries in it?

B. Do you prefer the chocolate ice cream, or do you prefer the banana split with strawberries in it?

C. Do you prefer the chocolate ice cream, and do you prefer the banana split with strawberries in it?