The best explanation for the fact that diamond is extremely hard is that diamond crystals

(A) are made up of atoms that are intrinsically hard because of their electronic structures

(B) consist of positive and negative ions that are strongly attracted to each other

(C) are giant molecules in which each atom forms strong covalent bonds with all of its neighboring atoms

(D) are formed under extreme conditions of tem­perature and pressure

(E) contain orbitals or bands of delocalized elec­trons that belong not to single atoms but to each crystal as a whole

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