Which of the following correctly explains why a weather balloon expands as it rises to higher altitudes?
A) There is less oxygen at higher altitudes.
B) There is greater exposure to solar radiation at higher altitudes. C) Atmospheric pressure is lower at higher altitudes, so the gas particles inside the balloon take up a greater volume.
D) Atmospheric pressure is higher at higher altitudes, so the gas particles inside the balloon take up a greater volume.
