What does a continental polar air mass typically bring with it?

A continental polar air mass is characterized by being formed over land in polar regions, leading to specific weather conditions. This type of air mass is typically associated with cooler temperatures and low humidity. As it moves into a region, it brings stable, cool, and dry conditions. The cool, dry air is a result of the air mass having less moisture content since it originates over land rather than over water, where more moisture would typically be absorbed.

The other types of air masses listed in the options suggest different characteristics. Warm, moist air would typically come from maritime tropical air masses, which are not relevant in this context. Unstable weather patterns are often associated with warm, moist air colliding with cooler air, which does not apply to the stable, cool conditions of continental polar air masses. High humidity levels are also not a feature of this type of air mass, which is characterized by lower moisture content. Thus, the correct understanding of a continental polar air mass aligns it with bringing cool, dry air, accurately represented by the correct answer.