Cold, dry air affecting the northern united states in winter often comes from

Amaritime polar air masses.
Bmaritime tropical air masses.
Ccontinental polar air masses.
Dcontinental tropical air masses.

Verified Answer :

Ccontinental polar air masses

Answer:

c. continental polar air masses

Explanation:

Cold air is dry because it doesn't gather as much water and is cold from the POLES. The cold dry air then amasses over the north or south CONTINENTS. Warming when approaching the equator then the air gathers water.