The jet stream over North America separates cold air masses in the north from warmer air masses to the south. The jet stream tends to move farther south in winter. How could this change in position affect weather in the United States?

A) Severe storms such as thunderstorms and tornadoes would only form in the far north during this time.

B) Cold fronts forming south of the jet stream would become stationary, producing dry conditions north of the jet stream.

C) Warmer air would tend to flow north, producing mild winter temperatures in regions that are normally colder.

D) Colder air would move farther south, producing colder temperatures in regions that are normally warmer.

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