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The exosphere is the layer of the atmosphere

Aclosest to the earth's surface.
Bthat absorbs ultraviolet radiation from the sun.
Cwhere gas molecules can be exchanged between earth's atmosphere and outer space.
Dwhere air temperature stops increasing with altitude and starts decreasing.

Verified Answer :

Edufirst

You can read in wikipedia that in planets with substantial atmposphere, the exosphere is the uppermost layer of the atmosphere where it merges with the interplanetary space (credit to wikipedia).

Then c. is the right option.
 

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