$(a)\;Troposphere\qquad(b)\;Stratosphere\qquad(c)\;Mesosphere\qquad(d)\;Thermosphere$

The mesosphere is the layer of the Earth's atmosphere that is directly above the stratosphere and directly below the mesopause. In the mesosphere, temperature decreases as the altitude increases. The upper boundary of the mesosphere is the mesopause, which can be the coldest naturally occurring place on Earth with temperatures below −143 °C (−225 °F; 130 K).

Mesosphere

Hence (c) is the correct answer.

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