Choose the letter of the sentence that best expresses the implied main idea of the following paragraph. 5. l In the past it often took years to force a car company to make even small, inexpensive changes. 2 In the 1960s, consumer advocate Ralph Nader had to fight for several years before Chevrolet stopped making the unsafe Corvair. 3 But in recent years, customer complaints and publicity have led to quick corrective actions. 4 For example, the Consumers Union recently reported that a11-terrainvehicles (ATVs) were unsafe when driven by untrained operators. 5 Within eighteen months, ATV makers stopped making unstable three-wheeled models and set up an extensive customer training program. 6 More recently, Consumer Reports magazine revealed safety problems in the Ford Bronco 11. 7 In response, Ford immediately announced a complete redesign and plans to market the re-engineered vehicle under a new name.