Suppose That a Tumor in a Person's Body Has a Spherical

Multiple Choice

Suppose that a tumor in a person's body has a spherical shape and that treatment is causing the radius of the tumor to decrease at a rate of 9 millimeters per month. At what rate is the surface area of the tumor decreasing when the radius is 2 mm? ​

A) Surface area is decreasing at the rate of 288π mm²/month.
B) Surface area is decreasing at the rate of 72π mm²/month.
C) Surface area is decreasing at the rate of 32π mm²/month.
D) Surface area is decreasing at the rate of 16π mm²/month.
E) Surface area is decreasing at the rate of 144π mm²/month.