Which regimen treats vitamin D deficiency most effectively?

Vitamin A is used to treat vitamin A deficiency.

Ascorbic acid is used to treat and prevent vitamin C deficiency.

Treating and preventing vitamin K deficiency.

Vitamin A is used for treating vitamin A deficiency.

Tocofersolan is used as a vitamin E supplement or to treat vitamin E deficiency in individuals who cannot absorb fats due to disease.

This medication is a multivitamin product used to treat or prevent vitamin deficiency due to poor diet, certain illnesses, or during pregnancy.

Cyanocobalamin is used to treat vitamin B12 deficiency in people with pernicious anemia and other conditions.

The proven and effective use of vitamin C is for treating vitamin C deficiency and conditions that result from it, like scurvy.

Phytonadione is used to treat vitamin K deficiency and to treat certain bleeding or blood clotting problems.