The retail cost of gasoline in the United States between the late 1940s and the early 1970s was characterized by both stable and comparatively low prices, with average costs around 20 cents per gallon. The correct answer is C: both A & B.
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Between the late 1940s and early 1970s, gasoline prices in the U.S. were characterized by both stable and comparatively low prices. Prices averaged around 20 cents per gallon during this time. Therefore, the correct answer is C: both A & B. ;