The four most common chemical elements found in living matter are 1,C, H,O, P
2,C, H,O, N
3,C, H,N, P
4,C, H,O, S
5,C, H,O, Ca​

Explanation:

In all living system we can always find basic elements carbon, oxygen, nitrogen and hydrogen, carbon is the basic building unit contained in living matter. The percentage of carbon in the mass of living matter is 19.0% oxygen and hydrogen are present in almost all organic compound which creates living organisms.

what's the

i might be wrong but i think its a. let me know if i’m right and have a good rest of your day!