Do oranges gain or lose vitamin C after being picked?

1. They don't lose vitamin C.

2. It loses vitamin C after a period of time.

3. They will decay after a long period of time and might lose the vitamin C inside.

4. It loses vitamin C when we add fertilizers to it when it is growing.

5. It loses vitamin C when it is heated.

6. When we slice the oranges into smaller pieces, it loses its vitamins.

7. It does not lose vitamin C after picked but will if salt is present.

8. Vitamin C is lost when the orange skin is removed.

9. When we squeeze the oranges to make orange juice, it loses vitamin C.