Determine the degrees of unsaturation of the following structures:

• A. (a) 5, (b) 5, (c) 3
• B. (a) 5, (b) 1, (c) 5
• C. (a) 4, (b) 4, (c) 5
• D. (a) 7, (b) 5, (c) 5

Answer: (D)