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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？ | 
