Which of the following measures should be taken for proper sanitation?

Restriction of open defecation is a step for proper sanitation.

People shouldn't defecate in public because doing so spreads a number of diseases and contaminates neighboring water sources when it mixes with the rainwater.
Other practices such as open storage of organic waste, dumping of plastics and discharging wastewater are not proper ways to increase sanitation as these processes increase chances of pollution.