I need help with a school crossword! The word is 3 letters, ends with E. The hint is: Farmers classify farm animals and plants according to this

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume