In a chemical equation, the chemical formula(s) located to the left of the arrow are called the _____, and the chemical formula(s) located to the right of the arrow are called the _____.
 a.
 subscript(s), coefficient(s)
 b.
 coefficient(s), subscript(s)
 c.
 reactant(s), product(s)
 d.
 product(s), reactant(s)