Each of the following oxides is added to separate equal volumes of distilled water. Which of the following is the most acidic oxide?

A.     \({{\text{P}}_{\text{4}}}{{\text{O}}_{{\text{10}}}}{\text{ }}\)

B.     \({\text{S}}{{\text{O}}_{\text{3}}}\)

C.     \({\text{C}}{{\text{l}}_{\text{2}}}{{\text{O}}_{\text{7}}}\)

D.     \({\text{Si}}{{\text{O}}_{\text{2}}}\)

C