A. it is cost-effective
B. contaminated faeces are completely kept away from flies
C. the water for flushing contains chlorine which kills the germs
D. It prevents flies from breeding

Correct Answer: Option B

B. contaminated faeces are completely kept away from flies

SEE ALSO  An organism at the start of a food chain which provides the total input energy into an ecosystem is the?

Copyright warnings! Do not copy.