Name the following compounds systematically.

• A. (i): cyclohexene
  (ii): 1,2-dimethylcyclopentene
• B. (i): cyclohexa-1,4-diene
  (ii): 1,6-dimethylcyclohexa-1,3-diene
• C. (i): cyclohexa-1,3-diene
  (ii): 1,2-dimethylcyclopenta-1,3-diene
• D. (i): cyclohexa-1,4-diene
  (ii): 1,5-dimethylcyclopenta-1,3-diene

Answer: (D)