An air bubble with a volume of $3.0\,\text{mm}^3$ is beneath the water. At its depth, the pressure of the air inside the bubble is four times atmospheric pressure. As the bubble rises to the surface, the temperature of the air in it remains constant. What volume does the air in the bubble have when it reaches the surface?
- A$3.0\,\text{mm}^3$
- B$9.0\,\text{mm}^3$
- C$12\,\text{mm}^3$
- D$15\,\text{mm}^3$