Explanation

McCollum discovered Vitamin D.

...

Elmer McCollum ForMemRS Known for Discovering in 1913.

Vitamin A,

Vitamin B,

and Vitamin D 

Elmer McCollum was an American biochemist 

while

Danish biochemist Carl Peter Henrik Dam discovered vitamin K.

Vitamin E was discovered by Evans and Bishop in 1922

In 1920-1940 discovered vitamin D(3) became classified as a vitamin rather than as a steroid hormone

ND16-8-2023