Question

which of the following is a sign that you have been exposed to a toxic substance?

settled dust
particles in mucous
coworkers begin showing symptoms
all of the above

Explanation:

Analyze the indicators of toxic substance exposure

• Settled dust on surfaces in the work area indicates that airborne particulates are present and have likely been inhaled or contacted.
• Particles in mucous (such as when blowing your nose) are a direct physical sign that foreign contaminants have entered your respiratory system.
• Coworkers showing symptoms of exposure suggests a shared environmental hazard that is actively affecting people in the same space.

Evaluate the options

• Since all three individual signs are valid indicators of exposure to a toxic substance, "All of the above" is the correct choice.

Answer:

• (A) Settled dust
• (B) Particles in mucous
• (C) Coworkers begin showing symptoms
• (D) All of the above (Correct answer)