Question

which condition causes storms to occur? freezing of water droplets sudden change in air pressure condensation of water vapor rapid heating of upper atmosphere

Explanation:

Storms occur due to a sudden change in air pressure. When there is a significant difference in air pressure between two areas, it creates a pressure gradient. This gradient causes air to move rapidly from the high - pressure area to the low - pressure area. This rapid movement of air can lead to the formation of storms.
Freezing of water droplets is more related to the formation of ice in clouds rather than the direct cause of storms. Condensation of water vapor is part of the cloud - formation process but not the main cause of storms. Rapid heating of the upper atmosphere is not a typical cause of storms as storms are more influenced by pressure differences near the Earth's surface.

Answer:

sudden change in air pressure