The number of naturally accusing chemical elements involved in bio chemical reaction is

A. 126 

B. 86 

C. 92 

D. 206

Detail: 

There are 92 naturally occurring elements, each differing from the others in the number of protons and electrons in its atoms. Living organisms, however, are made of only a small selection of these elements, four of which—carbon (C), hydrogen (H), nitrogen (N), and oxygen (O)—make up 96.5% of an organism's weight.