Beginning in 1966 all new cars sold in Morodia were required to have safety belts and power steering. Previously, most cars in Morodia were without these features. Safety belts help to prevent injuries in collisions, and power steering helps to avoid collisions in the first place. But even though in 1966 one-seventh of the cars in Morodia were replaced with new cars, the number of car collisions and collision-related injuries did not decline. Which of the following, if true about Morodia, most helps to explain why the number of collisions and collision-related injuries in Morodia failed to decline in 1966? ['In 1965, subtantially more than one- seventh of the cars in Morodia were replaced with new cars.', 'Because of a driver-education campaign, most drivers and passengers in cars that did have safety belts used them in 1966.', 'An excessive reliance on the new safety features led many owners of new cars to drive less cautiously in 1966 than before.', 'Most of the new cars bought in 1966 were bought in the months of January and February.']