Which of the Following Statements About the General Properties of the Main

Which of the following statements about the general properties of the main group nonmetals is incorrect?

A) The oxides of nonmetals tend to be acidic.
B) The ionization energies of the nonmetals increase down a group.
C) Nonmetals tend to be insulators.
D) Nonmetals tend to form monoatomic anions or oxoanions.
E) The highest possible oxidation state for all but the most electronegative nonmetals is equal to the group number of the element.