4 Which part of a fire extinguisher indicates that the pressure might be low, and therefore keep the fire extinguisher from properly discharging? A. Safety pin B. Handle C. Cylinder D. Gauge

## Step 1<br />The question is asking about the part of a fire extinguisher that indicates the pressure level. The pressure level is crucial because it determines whether the extinguisher can properly discharge to put out a fire. <br /><br />## Step 2<br />The options provided are: A. Safety pin, B. Handle, C. Cylinder, and D. Gauge. <br /><br />## Step 3<br />The safety pin is a safety feature that prevents the extinguisher from being accidentally discharged. The handle is the part that you hold when using the extinguisher. The cylinder is the main body of the extinguisher, which contains the extinguishing agent. <br /><br />## Step 4<br />The gauge, on the other hand, is a device that measures the pressure inside the extinguisher. If the pressure is low, the gauge will indicate this, and the extinguisher may not function properly.