Which Elements Account for More Than 97% of the Weight

Multiple Choice

Which elements account for more than 97% of the weight of most organisms?

A) C, H, N, Mg, O, S
B) C, H, N, O, P, S
C) C, H, N
D) Fe, C, H, O, P
E) Ca²⁺, K⁺, Na⁺, Mg²⁺, Cl^-