Choose the One Alternative That Best Completes the Statement or Answers

Choose the one alternative that best completes the statement or answers the question. Solve the problem.
-Water is falling on a surface, wetting a circular area that is expanding at a rate of How fast is the radius of the wetted area expanding when the radius is (Round your answer to four decimal places.)

A) 0.0221 mm/s
B) 0.0110 mm/s
C) 90.6573 mm/s
D) 0.0693 mm/s