Numbers Game: Objects on Plate May Be Larger Than They Appear

The surface area of an average dinner plate in the United States increased ______ percent from 1960 to 2005.

Source: Mindless Eating: Why We Eat More Than We Think by Brian Wansink.

a) 9
b) 17
c) 28
d) 36

Leave your guess in the "comments" section and come back on Saturday for the answer.