The Negative Externality That Could Potentially Cause the Most Harm

Multiple Choice

The negative externality that could potentially cause the most harm to humans is:

A) the greenhouse effect,which allows sunlight to enter the atmosphere and traps the heat.
B) the increase in the magnitude of the greenhouse effect and the resulting changes in the earth's climate.
C) increased acidity of lakes and streams caused by emissions of sulfur dioxide and nitrogen oxides.
D) the corrosion of metals and deterioration of stone caused by acid rain.