An anthropogenic water vapor is not a significant factor in global warming because its
This refers to those effects that are derived from human activities as opposed to those occurring in natural environments without human influences.
A very good example of Anthropogenic effects are effects associaited with something that is made by humans such as an are excessive greenhouse gasses.
Basically, the water vapor are anthropogenic but most sources of water vapour are via irrigation which is applied as a liquid and not through burning of fossil fuel.
The effect of water vapor is less significant because when this water evaporates, this evaporation cools the surface; when the water rains out later, it heats the troposphere by the same amount.
Therefore, the Option A and C is correct.
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