Pit Latrines (Also Called Pit Toilets) Are a Common Kind

Pit latrines (also called pit toilets) are a common kind of toilet in poorer nations. They collect human waste in a hole about 10 feet deep and 3 feet wide. While pit latrines can contribute to pollution of groundwater, they are much safer than open defecation. You are a sanitation engineer from a non-profit agency from a wealthy nation trying to convince people in a small town in a poor nation to replace open defecation with pit toilets. What strategy would work best?

A) Convincing your national legislators to withhold humanitarian aid to this nation until they agree to sign contracts to purchase pit latrines from manufacturers located in your nation
B) Providing photos of people in your country using pit latrines, which are common in state parks
C) Offering free public lectures about the science of sanitation to the community
D) Convincing local community leaders to install pit toilets around their own homes and businesses so that other members of the community can see these high-prestige people using them