Question

for precipitation to be solid, like snow or sleet, which statement must be true?
water droplets form clouds.
the air temperature must be warm.
the air temperature must be cold.
water vapor has evaporated.

Explanation:

Solid precipitation like snow or sleet forms when water vapor in the air freezes. This occurs in cold - air conditions. Water droplets forming clouds is a general part of the water - cycle but not specific to solid precipitation. Warm air temperature would prevent water from freezing. Evaporation of water vapor is the opposite process of precipitation formation.

Answer:

The air temperature must be cold.