Which of the following compounds is not possible?

A. SFs, because fluoride does not have empty d-orbitals available to form an expanded octet
B. OC₁₆, because oxygen does not have empty d-orbitals available to form an expanded octet
C. H, because hydrogen forms only positive ions
D. PbO₂, because the charge on a lead ion is only +2 E. C₂H₂, because carbon has four valence electrons