PLZ HELP I WILL GIVE BRAINLISTS TO RIGHT ANSWER

2KCIO3 → 2KCI+ 302
How many moles of oxygen are produced by the decomposition of 5.0 moles of potassium chlorate?

A )7.5 mol O2
B )5.0 mol O2
C )2.5 mol O2
D )9.0 mol O2