The correct options are
A Langar is managed by volunteers.
B The food materials for langar is contributed by people.
C People who served food will wash the plates and utensils.
Langar is a large dining hall in gurudwara. In a langar hall, people sit in rows on durries. Langar is managed by volunteers, therefore, it is seen as a good service and a privilege to help run it. People contribute to gurudwara by offering money and food materials. After having food, people who served food will clean the plates and wash the utensils. However there are volunteers to even clean the entire premises.