11.
The answer is: B
Explanation
World ORS (Oral Rehydration Salt) Day is observed annually on July 11th. It was established to raise awareness about the importance of oral rehydration therapy (ORT) in treating dehydration caused by diarrhea, which is a leading cause of death among children under the age of five, particularly in developing countries. The aim of World ORS Day is to promote the use of ORS as a simple, low-cost, and effective solution to prevent dehydration and reduce the mortality and morbidity associated with diarrhea.