Read the following context and choose the best option to answer the question.
Context: I was told to find the relative humidity of an area when the dry bulb on the psychrometer is 20 degrees Celsius and the wet bulb is 15 degrees Celsius . I found the temperature difference between the two and based on an information table , concluded that the relative humidity is 59 % . It then asks you to find the mass of the water that is in the air .
Question: What does the narrator seem to be studying ?
Options: 
A. They are studying air quality sciences .
B. They are studying global warming .
C. They are studying weather .
D. They are studying geology .


C