Approximately 4.5 liters of blood circulates in the body of the average human adult. How many quarts of blood does the average person have? Use the conversion equivalency 1 gallon = 3.785 liters and 4 quarts = 1 gallon.

First convert liters to gallons: 4.5 ÷ 3.785 ≈ 1.19 gallons. Then convert gallons to quarts: 1.19 × 4 ≈ 4.76 quarts. Therefore, the average person has about 4.76 quarts of blood, choice A.

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