It would be letter A which is energy. The other three are used in weather forecasting due to the fact that the atmosphere is fluid and weather and climate is caused by uneven heat from the star in our solar system which is the Sun to the Earth in which heat transfer occurs
Explanation:
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East coast United States is quite humid. You get past the appellation. You get more of a mild weather. Not to cold or hot. Just mild. You are along the Mississippi River. Temperatures get mild again. Get to the Rocky Mountains temperatures rise. Less humid and more hot. More of a desert. Then right in the Rocky Mountains desert. Then you get to the west coast. Cali, Oregon, Washington. You get all kinds of temperature. South Cali a desert. North Cali (?past San Francisco.( humid, mild) Oregon,( humid, mild) Washington ( mild).
