The correct options are
B Ozone is found in the Stratosphere.
D All weather phenomena occur in the troposphere.
All the weather phenomena like rainfall, fog and hailstorm occur in the troposphere. Stratosphere is almost free from clouds and associated weather phenomena, making the conditions most ideal for flying aeroplanes. It is in the stratosphere that ozone layer is found.
The ionosphere, which is a part of the thermosphere, helps in radio transmission as it reflects radio waves transmitted from the Earth.