Are the following structures aromatic? Explain.

• A. A is aromatic because of its cyclic structure, planar shape, fully conjugated π system, and 6 π electrons. B and C are not aromatic because B lacks a fully conjugated π system and C has 8 π electrons.
• B. A and C are aromatic because of their cyclic structure, planar shape, fully conjugated π system, and 6 π electrons. B is not aromatic because it lacks a fully conjugated π system.
• C. B is aromatic because of its cyclic structure, planar shape, fully conjugated π system, and 6 π electrons. A and C are not aromatic because A lacks a fully conjugated π system and C has 8 π electrons.
• D. B and C are aromatic because of their cyclic structure, planar shape, fully conjugated π system, and 6 π electrons. A is not aromatic because it lacks a fully conjugated π system.