单项选择题

A fifteen-pound CO₂ extinguisher（）.

A.contains 15 pounds of CO₂
B.weighs 15 pounds when full of CO₂
C.has 15 pounds of pressure at the nozzle
D.weighs 15 pounds when empty

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A fifteen-pound CO2 extinguisher（）.

A fifteen-pound CO₂ extinguisher（）.