The best shape for an automobile to have is one that is streamlined both in the front and in the back. The reason for this is
A. to ensure the air flow remains laminar all the way around the vehicle.
B. to use the viscosity of the air to help propel the automobile forward.
C. to improve fuel efficiency when driving in reverse.
D. to avoid uneven air flows that might push the vehicle sideways.
Answer: A
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