Short Answer: A
Long Answer:
All the things listed in A are well known greenhouse gases. In 'B', there are no greenhouse gases, and 'C' contains no greenhouse gases either. (No gases)
D:viruses are not killed by antibiotics.
I am not sure on this but I think it would be B) sorry if this is not the correct answer
Boundary between two air masses of different temperatures and/or humidity levels
Cells that protect the body by engulfing foreign cells or producing antibodies are D. White blood cells.
