Question

nccer 22102 - 12 - heavy equipment safety
accident prevention tags (safety tags) are used
as a temporary way to warn workers of dangers
just like signs are used
as a permanent means of protection
only in emergencies

Explanation:

Accident - prevention tags are temporary warning devices for workers about potential dangers. They are not permanent protection, not used just like signs (signs can be more permanent and general - purpose), and not only for emergencies.

Answer:

A. as a temporary way to warn workers of dangers