Answer:
Firstly, what plague? Are we talking about the Bubonic plague?
Explanation:
1) By rats, Which served as the vector which spread the disease.
2) Lack of hygiene and them throwing their sewage and was out of their window into the street.
Legislators make laws, so you could do something about that.
Answer:
C. Example A: separation of powers; Example B: checks and balances
Explanation:
These examples describe two events relating to the U.S. government, the answer choice that best matches the governmental policy that these events represent is separation of powers and checks and balances.
My bad, your question is incomplete, so my answer is probably wrong. Please disregard.