Which equation shows conservation of atoms?

Question

A.
H2 + O2 → 2H2O

B.
2H2 + 2O2 → 2H2O

C.
H2 + O2 → H2O

D.
2H2 + O2 → 2H2O

Answer 1

D. 2H2 + O2 → 2H2O