Answer:
C. An increase in altitude results in a decrease in temperature.
Step-by-step explanation:
The climate of an area is highly influenced by its altitude especially in mountain areas.
At higher altitudes or mountains, the air molecules above a given surface are fewer that decreases the air pressure in the area and decreases the temperature of the area as well. Because of fewer air molecules, gases absorb very little of the incoming solar radiation and cause decrease in temperature.
Hence, the correct answer is "C. An increase in altitude results in a decrease in temperature."