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.