Which statement correctly explains why the chemical equation below does NOT demonstrate the law of conservation of matter?

KCIO3---> KCI+O2

a
There are unequal numbers of all atoms on both the reactant and product side.
b
The number of Oxygen (O) atoms are not equal on both the reactant and product side.
c
The number of Potassium (K) atoms are not equal on both the reactant and product side.
d
The number of Chlorine (Cl) atoms are not equal on both the reactant and product side.

b

The number of Oxygen (O) atoms are not equal on both the reactant and product side.