Fei yen is researching and analyzing the history of environmental laws. she reads this paragraph about the 1990 updates to the clean air act and makes the inference that some people feared the law would be too difficult to enact quickly. read the paragraph and then answer the question.

to achieve environmental gains within a reasonable timeframe at the lowest feasible cost, the new law will take hold in … stages, with most controls fully in effect by 2005. what, specifically, are some of these gains? emissions that cause acid rain (sulfur dioxide and nitrogen oxides) will be cut to roughly half of 1980 emission levels. more than thirty million tons of noxious air pollutants will be removed from the air each year. every part of the country finally will have means to attain healthy air on a realistic schedule. and the risk from toxic air emissions will be cut by three-fourths.

which evidence from the paragraph supports fei yen’s inference?
a. and the risk from toxic air emissions will be cut by three-fourths.
b. more than thirty million tons of noxious air pollutants will be removed from the air each year.
c. every part of the country finally will have means to attain healthy air on a realistic schedule.
d. emissions that cause acid rain (sulfur dioxide and nitrogen oxides) will be cut to roughly half of 1980 emission levels.