Q29:

The emission of sulfur dioxide when high-sulfur coal is burned is restricted by law. New

coal-burning plants usually comply with the law by installing expensive equipment to

filter sulfur dioxide from their emissions. These new plants could save money by

installing instead less expensive cleaning equipment that chemically removes most sulfur

from coal before combustion.

Which of the following, if known, would be most relevant to evaluating the claim above

about how new coal-burning plants could save money?

A. Whether existing oil-burning plants are required to filter sulfur dioxide from their

emissions

B. Whether the expense of installing the cleaning equipment in a new plant is less

than the expense of installing the cleaning equipment in an older plant

C. Whether the process of cleaning the coal is more expensive than the process of

filtering the emissions

D. Whether lawful emissions of sulfur dioxide from coal-burning plants are

damaging the environment

E. Whether existing plants that use the filtering equipment could replace this

equipment with the cleaning equipment and still compete with new plants that

install the cleaning equipment

ans：B mine C？