One reason it was a health threat is it caused teeth to become ground down which would then lead to infections. The same was true with their eyes and lungs, sand would be blown into their eyes or inhaled into their lungs and then could cause infections.
The answer is B iknow this because i took this assignment
1. they advised the consuls in how they act
2.Advising the consuls and working for the Senate
3. All of the free adult male citizens of the state