The use of seat belts in cars has significantly reduced the number of crash
fatalities. Which statement best explains how societal demand guided the
development of seat-belt technology?
A. Engineers improved the design of seat belts because consumers
wanted them to be easier to use.
B. Car manufacturers recognized the dangers of not wearing seat
belts in cars and then lobbied the government to make laws that
required their use.
C. Engineers developed seat-belt technology and then began a public
awareness campaign to educate people on how they could be
used to make cars safer.
D. When new seat-belt technology became available, consumers
began to demand their inclusion in all new cars.