Question

Low air pressure usually means bad weather. This is because _____.

Answer 1

The best and most correct answer among the choices provided by your question is the first choice or lettter A.

Low air pressure usually means bad weather. This is because: warm air rises and condenses, usually forming clouds and precipitation.

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Answer 2

The answer is:

warm air rises and condenses, usually forming clouds and precipitation

In order to understand this you have to think that as hot air containing water vapor and other gases rises it cools down, and creates clouds that will continue to rise and cool down even more, this will eventually create precipitation.