Which of the Following Statements Correctly Describes the Behavior of Heterocycles

Which of the following statements correctly describes the behavior of heterocycles in aromatic substitution reactions?

A) Pyridine N-oxide is considerably more reactive toward electrophilic aromatic substitution reactions than pyridine because the oxygen atom can donate electrons into the ring by resonance.
B) Pyridine N-oxide undergoes electrophilic aromatic substitution primarily at C-3.
C) Pyridine is less reactive than benzene toward nucleophilic aromatic substitution.
D) Nucleophilic aromatic substitution of pyridine takes place at C-3 because attack at this position leads to the most stable intermediate.
E) none of the above