Which layer of the atmosphere is directly above the troposphere?

The troposphere is the first layer above the surface and contains half of the earth's atmosphere as this is where all of the weather occurs
many jet aircrafts fly in the stratosphere because it is very stable and more high up. also, the ozone layer absorbs harmful rays from the sun.
meteors or rock fragments burn up in the mesosphere. above the previous
the thermosphere is a layer with auroras (and is where the space shuttle orbits)
the atmosphere merges into space in the super thin exosphere
which is known as the upper limit of our atmosphere.

The troposphere is the first layer above the surface and contains half of the earths atmosphere.

The correct answer is d