Which of the following hazards oan severely harm a worker's lungs? A. excessive noise
B. heat exposure
C. vehicle hazards
D. bins and silos

I think that this might be your answer :) I tried hope this helps !

Explanation:

A) Heat exposure Because In terms of weather Heat:  Inhaling hot air, induces airway constriction making it difficult to breathe.

Also Of course, it's known that smoke from fire can have a terrible effect on your lungs. It can restrict oxygen flow, which can and most likely be deadly. So the exposure to the heat will distract them cause they cant breath while they work .

so whats the answer

the answer is 100% density i've answered this question before and done the quiz myself.