Rank, in increasing order, the biological energy content of the following four molecules:
i. galactose
ii. tricosanoic acid, C₂₃H₄₆COOH
iii. lactose
iv. stearic acid, C₁₇H₃₅COOH

• A. i < ii < iii < iv
• B. i < iii < ii < iv
• C. i < iii < iv < ii
• D. iv < iii < ii < i

Answer: (C)