During the Decomposition of CaCO₃(s)into CaO(s)and CO₂(g),100 $\circ$ C with an Atmospheric Pressure of 755 MmHg

During the decomposition of CaCO₃(s) into CaO(s) and CO₂(g) ,100.0 mL of gas is collected by the displacement of water in a flask at 25 ^$\circ$ C with an atmospheric pressure of 755 mmHg.The vapor pressure of water at this temperature is 23.8 mmHg.What mass of oxygen was collected?

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