You are responding to the scene of a train derailment involving multiple tanker railcars. Which of the following situations would present the greatest risk for a secondary contamination incident?
A. A decontaminated patient at an ammonia leak incident is now coughing.
B. An oxygen tank used in the hot zone to treat a patient that is then brought to the ambulance.
C. Contaminated tools used in the rescue operation are brought from the hot zone into the warm zone.
D. A change in wind direction causes the hazardous material to engulf the medical command area.