Question

how can the spread of disease through contaminated water be limited?
a. individuals can wash their hands often.
b. individuals can avoid contact with contaminated food.
c. sewage systems can be regulated and controlled.
d. individuals can avoid contact with sick people.

Explanation:

• Option A: Washing hands often mainly helps against germs from various sources (not just contaminated water - related diseases).
• Option B: Avoiding contaminated food is about food - borne diseases, not water - borne disease spread limitation.
• Option C: Regulating and controlling sewage systems can prevent sewage (which may carry disease - causing agents) from contaminating water sources, thus limiting disease spread through contaminated water.
• Option D: Avoiding contact with sick people is related to person - to - person disease transmission, not water - borne disease spread.

Answer:

C. Sewage systems can be regulated and controlled.