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 not be used on a square stem valve.
B) The wrench should be removed from the valve while soldering.
C) The valve should be opened at least four turns to minimize internal pressure.
D) The valve should be opened less than two-and-a-half turns.
D
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