The word smaller is cut off plz answer asap 20

Question 20 (1 point) Listen A propane tank is to hold a volume of 300m of propane. The tank will be in th shape of a cylinder with a hemisphere on one end. The machinery cannot manufacture a cylinder with any measure (including the radius) that is any smal than 2m. The hemisphere costs three times the amount of the cylinder to manufacture. The radius will minimize the overall cost (two 2 decimal places) is 2.56 m 3.0 m 12.9 m 4.1 m