Which of the Following Statements Is TRUE

Which of the following statements is TRUE?

A) In nucleophilic substitution reactions at a saturated carbon atom, a carbon with a positive charge behaves as a nucleophile.
B) Nucleophilic substitution reactions at a saturated carbon atom can follow one of three mechanisms: S_N1, S_N2, and S_N3.
C) A carbon atom with a partial positive charge can react with a nucleophile, a molecule, or ion that has a lone pair of electrons.
D) Alkanes are an example of saturated organic compounds that easily participate in nucleophilic substitution reactions at a saturated carbon atom.
E) In nucleophilic substitution reactions at a saturated carbon atom, the replaced group is called an electrophile.