Question

which term refers to the amount of water vapor in the air? A) dew point B) Precipitation C) humidity or D) relative humidity ?

Answer 1

C) Humidity.
The amount of water vapor in the air is called humidity. Don't get it confused with relative humidity, its the amount of water vapor present in air expressed as a percentage of the amount needed for saturation at the same temperature.
XD

Answer 2

Hey there 

The answer is humidity. Humidity is the amount of water vapor in the atmosphere.

Correct answer is (C).