This violent weather produces a mass of warm, humid air that rises quickly, and more warm air rushes in to replace it.
a. compound
c. compound-complex
b. complex

“This violent weather produces a mass of warm, humid air that rises quickly, and more warm air rushes in to replace it” is a compound-complex sentence. So the correct option for the given question is option “c”. A compound-complex sentence is a sentence that is made up of one or more than one dependent clauses and two independent clauses.  These kind of sentences are very common in English but special care should be taken while writing such type of complicated sentences.

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