Using oil as a fuel has negative consequences for the environment, English homework help

A student is concluding an essay about the benefits of fuel-efficient cars. Which of the following would best conclude that essay?

A) Using oil as a fuel has negative consequences for the environment.
B) More efficient cars are interesting to many people not learning to drive.
C) We make change happen by taking an interest in the choices we have.
D) Increasing fuel efficiency can help us both financially and ethically.

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