Respuesta :
Answer:
B. H2O.
Explanation:
It is H2O (water) which is a compound of hydrogen and oxygen.
Answer:
b. H2O
Explanation:
A. is a single element, not a compound.
C. is simply two atoms of the same element, not a compound.
D. is simply a single element like A. Not a compount.
B. is two elements which are chemically bonded in a definite ratio.