Bubble Mumble

When a goldfish puffs out an equal amount of air each time he mumbles under water, how do the bubbles form?

A. The bubbles gradually get larger as they get closer to the surface.
B. The bubbles always stay the same size throughout the ascent.
C. The bubbles gradually shrink as they reach the surface.
D. None of the above. The bubbles will randomly vary in size.

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