Tow soap bubbles A and B are formed at the two open ends of a tube. The bubble A is smaller then bubble B. If the valve on the tube connecting the two bubbles is opened and air can flow freely between the bubbles, then
A. there is no change in the size of the bubbles
B. the two bubbles will becomes of equal size
C. A will becomes smaller and B will become larger
D. B will becomes smaller and A will becomes larger
