The main types of air mass include maritime tropical(mT) maritime polar(mP) maritime arctic(mA) continental polar(cP)

The correct answer is: A. All of the above

Maritime tropical (mT) air masses form over the warm oceans near the equator. They are warm and moist, and they often bring thunderstorms and heavy rain to coastal areas.

Maritime polar (mP) air masses form over the cold oceans near the poles. They are cold and moist, and they often bring rain or snow to coastal areas.

Maritime arctic (mA) air masses form over the coldest parts of the Arctic Ocean. They are very cold and dry, and they often bring snow to coastal areas.

Continental polar (cP) air masses form over the cold continents near the poles. They are cold and dry, and they often bring snow to inland areas.

All of these air masses can affect the weather in different parts of the world.