During the Decomposition of KClO₃(s) into KCl(s) and O₂(g), 100 $\degree$

During the decomposition of KClO₃(s) into KCl(s) and O₂(g) , 100.0 mL of gas is collected by the displacement of water in a flask at 25 $\degree$ C with an atmospheric pressure of 755 mmHg.The vapor pressure of water at this temperature is 23.8 mmHg.What mass of O₂ is collected?

A) 0.679 mg
B) 21.7 mg
C) 12.9 mg
D) 0.807 mg
E) 126 mg