Although the following molecule contains atoms with four different groups attached, why is it not chiral?

• A. The atom is not chiral because it is cyclic.
• B. The atom is not chiral because it has more than one chiral center.
• C. The atom is not chiral because it does not have a chiral center.
• D. The atom is not chiral because it has a plane of symmetry.

Answer: (D)