An electrically "charged mist" will be found in a __________.

Correct Answer: Option B — cargo tank during Butterworthing

Butterworthing, or tank cleaning using high-pressure water jets, can generate an electrically charged mist. This static electricity buildup poses a significant explosion hazard if the tank atmosphere is within the flammable range, necessitating strict grounding and inerting procedures to prevent electrostatic discharge during the cleaning process.