Question

why does air temperature increase with altitude in the stratosphere?
ozone molecules absorb ultraviolet radiation from the sun.
the density of air in this layer is extremely low.
carbon dioxide in this layer traps solar energy.
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Explanation:

The stratosphere contains ozone. Ozone molecules absorb ultraviolet (UV) radiation from the Sun. When they absorb this UV radiation, it is converted into heat energy. This heat energy causes the air temperature to increase with altitude in the stratosphere. The option "The density of air in this layer is extremely low" is more related to how temperature is perceived in terms of heat transfer (since low - density air has fewer molecules to transfer heat, but it doesn't explain the increase). Carbon dioxide is mainly associated with the greenhouse effect in the troposphere (lower layer of the atmosphere) and not the main reason for temperature increase in the stratosphere.

Answer:

Ozone molecules absorb ultraviolet radiation from the Sun.