In the Case of an Emergency When No Dust Mask

In the case of an emergency when no dust mask or respirator is available, _____ will suffice until you can get out of the area.

A) a wet handkerchief tied snugly around your face covering your mouth and nose
B) using your gloved hand to cover your mouth and nose
C) pulling your shirt up and over your mouth and nose and holding tightly with your hand
D) placing and holding your mouth and nose tightly in the bend of your elbow