Answer:
C/km
Step-by-step explanation:
Rate at which the temperature changes as per altitude change = [tex]\frac{Change in the temperature}{Change in the altitude}[/tex]
Change in the temperature is measured in Celcius (C) and change in the altitude is measured in Kilometers (km).
Note that altitude is nothing but height.
Hence, the appropriate unit for Anoop's purpose is C/km.