Istill can't figure this question someone ?

lars is balancing equations with his study group. he is unsure about one equation because each member of the study group came up with a different answer. which is the proper way to balance the equation ca(oh)2 + h3po4 → ca3(po4)2 + h2o?

a) ca(oh)2 + h3po4 → ca3(po4)2 + 6h2o
b) 3ca(oh)2 + 2h3po4 → ca3(po4)2 + 6h2o
c) 3ca(oh)2 + 2h3po4 → ca3(po4)2 + 3h2o
d) ca(oh)2 + 2h3po4 → ca3(po4)2 + 6h2o

Answer;

B) 3Ca(OH)2 + 2H3PO4 → Ca3(PO4)2 + 6H2O

Explanation;According to the law of conservation of mass, the mass of reactants should always be the same as the mass of the products in a chemical equation. Therefore, the number of atoms of each element in a chemical equation should always be the same on both sides of the equation, that is the side of reactants and side of products.Thus, any chemical equation requires balancing to ensure that the number of atoms of each element is equal in both sides of the equation. Balancing is a try and error process that ensures that the law of conservation of mass holds.In this case, the balanced equation that obeys the law of conservation of mass is B, as the number of atoms of each element are equal in both sides of the equation.

B.

First, we balance the Ca atoms for the production of one mole of Ca₃(PO₄)₂
This eliminates options A and D.
Next, we just balance either the oxygen or hydrogen and we see that equation B is correct.