The surface area of a sphere is 4?r. Find the percentage increase in its diameter when the surface area increases by 21%.a. 30.2%b. 33.1 %c.

The surface area of a sphere is 4?r². Find the percentage increase in its diameter when the surface area increases by 21%.a. 30.2%b. 33.1 %c. 34.5 %d. 30.9 %