In the 1950s, scientists determined that exhaust from cars was a significant
source of air pollution. Since then, the U.S. Environmental Protection Agency
has set standards to reduce the air pollution caused by cars. As a result, auto
and fuel manufacturers have developed new technologies. Which statement
best explains how government regulation's guided the development of these
technologies?
A. As car manufacturers became aware of the demand for cleaner
air, they requested money from the government to help with
research and development.
OB. As the public need for better air quality became understood, laws
were enacted to mandate the development of cleaner fuels and
more efficient engines.
C. Engineers recognized the hazards that air pollution posed to the
environment and decided to put pressure on the government to
enact laws mandating its reduction.
OD. After laws were passed that mandated the development of air