Which of the Statements About the Behavior of the Element

Which of the statements about the behavior of the element carbon in organic molecules is incorrect?

A) Carbon can be involved in polar covalent bonds.
B) Carbon can form single,double,or triple bonds with other carbon atoms.
C) Carbon always forms four bonds.
D) When carbon forms four single bonds,the bond angles are 90°.
E) In addition to other carbon atoms,carbon is likely to form bonds with hydrogen,nitrogen,or oxygen.