A Scuba Diver at a Depth of 20 M Exhales,releasing

A scuba diver at a depth of 20 m exhales,releasing a spherical bubble of gas.The bubble floats towards the surface maintaining its spherical shape.When the bubble is 1.0 m below the surface,its diameter is 17 cm.What was the diameter of the air bubble just as it left the diver?

A) 10 cm
B) 17 cm
C) 14 cm
D) 12 cm
E) 15 cm