Do oranges gain or lose vitamin C after being picked?

They don't lose vitamin C.

It loses vitamin C after a period of time.

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

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

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

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

It loses vitamin C when it is heated.

Vitamin C is lost when the orange skin is removed.

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