yes mistakenly I typed UV, it is IR ,my point is that key is wrong, IR absorption by green house effect is follows By their percentage contribution to the greenhouse effect on Earth the four major gases are:

water vapor, 36–70%
carbon dioxide, 9–26%
methane, 4–9%
ozone, 3–7%
water vapors play major role. all option given in the answer are correct,but best choice is water vapor not CO2. SPSC is having their own homely science.