Answer:
B. carbon dioxide is the correct answer.
Step-by-step explanation:
The greenhouse effect is caused by human activities like cutting the forest and fossil fuel burning, increase the level of carbon dioxide gas(greenhouse gases) and creates global warming.
When the fossil fuel is burned carbon combines with oxygen to form Carbon dioxide and it increases the concentration of greenhouse gases and give rise to global warming.
The Greenhouse gases Carbon dioxide traps the radiating heat from the Earth, this heat is absorbed in the form of infrared radiations and the radiation is emitted which warmer the lower atmosphere and Earth surface,this result in melting of ice sheets, glaciers and warming the ocean
Thus carbon dioxide greenhouse gases which creates global warming.