Concept:Relief rainfall is caused when moist air is forced upward by a physical barrier such as a mountain or highland.
Explanation:Warm, moist winds approach a highland and are forced to rise.
As the air ascends, it cools and condenses, forming clouds and rain.
This rain falls mainly on the windward side of the highland.
Lowlands, peneplains, and deserts do not generally force air to rise in this way.
Thus, relief rainfall is strongly linked to highland areas.
Answer:C. highlands