Which of the Following Is a Correct Set of Oxidation

Multiple Choice

Which of the following is a correct set of oxidation numbers for the atoms in calcium dihydrogen phosphate,Ca(H₂PO₄) ₂?

A) Ca = +2,H = +1,P = +5,O = -2
B) Ca = +2,H = 0,P = +7,O = -8
C) Ca = +2,H = -1,P = +4,O = -2
D) Ca²⁺ = +2,H₂PO₄^- = -1
E) Ca = +2,H = +1,P = +3,O = -2