The surface area of a sphere is same as the curved surface area of a right circular cylinder whose height and diameter are 16 cm each. The radius of the sphere is
Choose the correct choice.
A) 3 cm  B) 4 cm  C) 6 cm  D) 8 cm  E) none

Rationale: "solution 4 î r 2 = 2 î 8 x 16 â ‡ ’ r 2 = ( 8 x 16 / 2 ) â ‡ ’ 64 â ‡ ’ r = 8 cm . answer d"
Answer: D