jmc

Out of all the cookies, Art's has an area of $12{\text{ in}}^2$, which was the greatest area out of all the cookies' areas. Roger's cookie had an area of $8{\text{ in}}^2$, and both Paul and Trisha's cookies had an area of $6{\text{ in}}^2$. This means $\boxed{\text{Art}}$ makes the fewest cookies, since his cookie area is the greatest. The answer is not that there is a tie between Paul and Trisha because they can make the most cookies with a given amount of cookie dough, not the least.