The boundary between the troposphere and stratosphere is called the

a.

thermopause.

c.

stratopause.

b.

mesopause.

d.

tropopause.

Option D, tropopause

Explanation:

Tropopause is the boundary layer between the stratosphere and the troposphere. It acts like a separator between the stratosphere and the troposphere. It forms the upper part of the troposphere and its temperature starts getting stabilized as one move towards the stratosphere. The thickness of the tropopause is not constant and it  varies  continuously with the latitude, season and day and night.

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