Final answer:
C. An increase of 1 km in altitude corresponds to a decrease of 6.5°C in temperature. This is consistent with the lapse rate in the troposphere, where temperature decreases by about 6.5°C per kilometer of altitude gained.
Step-by-step explanation:
In the troposphere, as altitude increases, air temperature drops at a relatively uniform rate. The rate at which the temperature decreases with an increase in altitude is known as the lapse rate. When we apply a linear model to this situation, the correct statement is:
C. An increase of 1 km in altitude corresponds to a decrease of 6.5°C in temperature.
This is because, in the troposphere, the temperature typically decreases by about 6.5°C for every 1 kilometer increase in altitude. This lapse rate is crucial for understanding atmospheric physics and weather patterns.