Cold fronts that produce squall line thunderstorms in the U.S.Midwest are associated with which two air masses?

Question

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Cold fronts that produce squall line thunderstorms in the U.S. Midwest are typically associated with mT (warm, moist tropical) air masses, which provide moisture and instability, and cP (cold, dry polar) air masses, which provide the necessary temperature contrast to fuel the development of thunderstorms. Choice D is the only option that includes both mT and cP air masses.

Cold Fronts That Produce Squall Line Thunderstorms in the U