Solve the Problem $r = \sqrt { \frac { S } { 4 \pi } }$

Multiple Choice

Solve the problem.
-The radius of a spherical balloon is found usingdius of a spherical balloon is found using r $r = \sqrt { \frac { S } { 4 \pi } }$ where S i where S s the surface area of the balloon. Approximate the radius of a balloon whose surface area is 18 square inches. (Round to the nearest hundredth.)

A) 0.28 in.
B) 2.39 in.
C) 1.20 in.
D) 2.12 in.