Read the passage. Higher gas prices and concerns about the environment have led many consumers on a quest for alternative fuels. The problem is that most people are not familiar with the options. Electric engines are in use in some cities. Currently, the most popular alternative to gasoline is the hybrid engine, which combines a battery-powered electric motor with a gasoline engine. What is the cause of consumers seeking alternative fuels? a. the quest for alternative fuels b. hybrid engines now most popular c. higher gas prices and concerns about the environment d. consumers not familiar with options