单项选择题

A “fifteen-pound” CO₂ extinguisher is so called because（）.

A.there are fifteen pounds of CO₂ in the container
B.the container，when full，weighs fifteen pounds
C.the pressure at the discharge nozzle is l5 psi
D.the empty container weighs fifteen pounds

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A “fifteen-pound” CO₂ extinguisher is so called because（）.