Final answer:
The movement of a frontal system combined with the orientation of mountains C. can enhance the lifting of humid air, causing increased precipitation on the windward side due to orographic lifting, while the leeward side remains dry in a rain shadow effect.
Step-by-step explanation:
The movement of the frontal system and the direction of travel in relation to the orientation of the mountains can combine to enhance the lifting of the humid air. The orthographic lifting process, as this phenomenon is known, can intensify precipitation on the windward side of the mountains. For example, as humid air travels over mountains, it rises and cools, leading to condensation and potentially heavy rainfall. In contrast, the leeward side of the mountains, often called the rain shadow region, can remain dry, similar to the conditions commonly found in deserts, which have very little rainfall.
The movement of the frontal system and the direction of travel in relation to the orientation of the mountains can combine to enhance the lifting of the humid air. The interaction between the frontal system and the mountains can create an effect known as orographic lifting, which occurs when moist air is forced to rise as it encounters the mountains. This lifting process can lead to increased precipitation on the windward side of the mountains.