All changes in the weather are caused by the:
A.) Earth
B.) Sun
C.) Moon
D.) None of the above

Hint: As far as the proper definition of weather is concerned, it is the state of atmosphere with respect to physical factors like temperature, precipitation, air pressure and cloud cover.

Complete Solution :
All changes in the atmosphere can be said are caused by the sun.
This can be easily explained that the Energy that the Earth receives from the Sun is the basic cause of our changing weather as Solar heat or the heat received by the Earth from Sun warms up huge masses of air that are comprised of large and small weather systems and the much observed day-night and summer-winter cycles in the weather have consequently obvious causes and effects.
So, the correct answer is “Option B”.

Note: One is advised to remember that though weather is just the state of atmosphere at any time in inclusive of physical factors like temperature, precipitation, air pressure and cloud cover but day to day changes in the weather are only due to winds and storms whereas seasonal changes are due to the Earth revolving around the Sun.