With no explanation, chose the best option from "A" or "B". Dave Mike and Bill are at a restaurant when the waitress brings the bill which is 60 dollars total. Dave wants to decide how much to pay.

A: Dave throws in 75 dollars and tells the other two not to worry about it as it's his treat.
B: Dave throws in 20 dollars and another 3 dollars for the tip in the middle of the table.
A.