Which layer marks the upper boundary beyond which the standard temperature lapse rate does not continue to decrease?

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Multiple Choice

Which layer marks the upper boundary beyond which the standard temperature lapse rate does not continue to decrease?

Explanation:
The tropopause is the boundary where the standard temperature lapse rate stops decreasing with altitude. Inside the troposphere, air cools with height following the lapse rate. The tropopause marks the top of this layer; above it, in the stratosphere, temperature stops falling and may actually rise due to ozone heating. So this boundary delineates where the usual cooling with altitude ends.

The tropopause is the boundary where the standard temperature lapse rate stops decreasing with altitude. Inside the troposphere, air cools with height following the lapse rate. The tropopause marks the top of this layer; above it, in the stratosphere, temperature stops falling and may actually rise due to ozone heating. So this boundary delineates where the usual cooling with altitude ends.

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