Why might opening the acetylene cylinder's square stem valve three-and-a-half turns with a wrench and leaving the wrench on the valve while working create a hazardous situation?
A) The wrench should be removed from the valve while soldering.
B) The valve should be opened less than 2 and a half turns.
C) The valve should be opened at least four turns to minimize internal pressure.
D) The wrench should not be used on a square stem valve.
B
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