Relative Humidity Is

Multiple Choice

Relative humidity is

A) the amount of water vapour in the air compared to the normal amount,expressed as a percentage.
B) the amount of moisture in the air relative to your own sensible feelings.
C) the amount of water vapour in the air at a given temperature expressed as a percentage of the water vapour capacity of the air.
D) a basically unused concept when it comes to weather topics.
E) the total amount of water vapour the air can hold compared to the volume of water on the planet.