What should you do when the alarm bell on a self-contained breathing apparatus sounds?

A. Immediately evacuate the contaminated area.
B. Open the bypass valve on the regulator and immediately evacuate the contaminated area.
C. Move the tank selector lever to the full tank position and reset the alarm so you can evacuate the area when it sounds again.
D. Move the reserve lever to the 'reserve' position on the regulator and reset the alarm so you can evacuate the area when it sounds again.

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