Solve the Problem $\mathrm { r }$ Is Given by the Function

Multiple Choice

Solve the problem.
-The area of a circle with radius $\mathrm { r }$ is given by the function $\mathrm { A } ( \mathrm { r } ) = \pi \mathrm { r } ^ { 2 }$ . Find the area of the base of a circular storage tank if the radius is 4 feet long. Use $\pi = 3.14$ .

A) $25.12$ square feet
B) $12.56$ square feet
C) $50.24$ square feet
D) 48 square feet