The troposphere is the layer of the atmosphere where these airplanes cruise. Thus, the correct option is D.
What is Atmosphere?
An Atmosphere may be defined as the layer of numerous gases that is present around the celestial body like the earth.
The troposphere is the layer of atmosphere in which passenger aircraft fly. This layer is closest to the earth. Within this layer, each type of aircraft utilizes a distinct altitude depending on its requirements.
Therefore, the troposphere is the layer of the atmosphere where these airplanes cruise. Thus, the correct option is D.
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