Which of the Following Criteria Is Necessary for a Nucleophilic

Multiple Choice

Which of the following criteria is necessary for a nucleophilic aromatic substitution reaction?

A) the ring must contain a very strong electron withdrawing group
B) the ring must contain a leaving group
C) the leaving group must be ortho or para to the electron withdrawing group
D) the leaving group must be meta to the electron withdrawing group
E) A, B and C