Which of the following statements about carbon is not correct?

• A. Carbon forms strong covalent bonds to itself, allowing chains and rings to be made.
• B. Carbon expands its valence shell to accomodate more than eight electrons and thus forms double and triple bonds.
• C. Carbon forms strong covalent bonds to elements like nitrogen and oxygen because it does not have lone pairs of valence electrons to destabilize the bonds
• D. Carbon and hydrogen have similar electronegativity and form strong bonds to each other, thus avoiding the high reactivity shown by metal hydrides.