问一道数学题目，感谢，急

蓝色小丑鱼

on an aerial photograph ,the surface of a pond appears as circular region of ardius 7/16 inch.If a distance of 1 inch on the photograph corresponds to an actual distance of 2 miles,which of the following is closet estimate of the actual surface area of the pond,in square miles?
A1.3 B2.4 C3.0 D3.8 E5.0
答案是B，感谢。

caichao8724

半径是7/16 Inch
地图上1inch对应2mile
所以7/16inch 对应 7/8mile

r=7/8mile
求面积 s=3.14*r^2=2.404