Determine whether the ion given below is aromatic, antiaromatic, or nonaromatic. If the ion is aromatic/antiaromatic, calculate the n in the Hückel's/Breslow's rule. If it is nonaromatic, justify your answer using the rules of aromaticity.

• A. The ion is aromatic, and n = 1. 
• B. The ion is aromatic, and n = 2. 
• C. The ion is antiaromatic, and n = 1. 
• D. The ion is antiaromatic, and n = 2. 
• E. The ion is nonaromatic because the molecule is not planar.

Answer: (D)