Which sample contains the largest amount, in mol, of oxygen atoms?

A.     0.20 mol \({{\text{P}}_{\text{2}}}{{\text{O}}_{\text{5}}}\)

B.     0.30 mol \({{\text{O}}_{\text{3}}}\)

C.     0.40 mol \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}}\)

D.     0.80 mol \({{\text{H}}_{\text{2}}}{\text{O}}\)

A