Answer:
Option (A) and (C).
Step-by-step explanation:
Global warming may be defined as the increase in the average earth's temperature. The global warming occurs due to human activities like deforestation and urbanization.
The green houses gases are responsible for increase in the global warming. Gases like water vapor, methane and carbon dioxide can trap the heat and causes global warming. The green house effect is directly proportional to the amount of green house gasses as more heat are trapped by green house gases.
Thus, the correct answer is option (A) and (C).