When Sulfur Dioxide Is Released into the Atmosphere,it Combines with Hydrogen

Multiple Choice

When sulfur dioxide is released into the atmosphere,it combines with hydrogen to form sulfuric acid,also known as particulates.The health costs associated with these particulates:

A) can be observed by comparing outcomes in areas with high levels to outcomes in areas with low levels of particulates.
B) is not significant because economic costs relate only to property damage.
C) cannot be estimated because there is no way to determine the cause of differential health outcomes.
D) can best be estimated based on quasi-experiments with treatment and control groups.