A certain singer at an outdoor concert can be heard for 1 mile in all directions. after an adjustment is made to her

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A certain singer at an outdoor concert can be heard for 1 mile in all directions. after an adjustment is made to her microphone, the singer can be heard for 2 miles in all directions. By approximately how many square miles was the region in which should be hard increased by the adjustment?

A. 1 square mile
B. \(\pi\) sq. miles
c. \(2\pi\) sq. miles
D. \(3\pi\) sq. miles
E. \(4\pi\) sq. miles

[spoiler]OA=D[/spoiler]

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