Which element is considered the most versatile element in living organisms and why?

We are all carbon based organisms , so i would say that carbon is the most important element to us and to all living organisms oxygen and hydrogen are important too but...

but every element is really important to all living things , without one Element we can't function a certain organ , like a puzzle , without one piece it wouldn't be right

Im assuming this is a multiple choice answer what is the answers to chooce from?

They are k strategist i think