Question

9. Why is the law of conservation of mass true?

a. All atoms at the start of a chemical reaction are present at the end of the reaction.
b. All the molecules in a substance remain intact during a chemical reaction.
c. The substances at the start of a chemical reaction gather more atoms to make up
for those lost in the reaction.
d. All molecules at the start of a chemical reaction are present at the end of the
reaction

Answer 1

I think it's D but I'm not too sure. Let me know if it's correct !