Given a terpenoid with five methyl group branch points, synthesize a method to determine the number of isoprene units.

• A. Count the number of carbon atoms to determine the number of isoprene units.
• B. Count the number of methyl group branch points to determine the number of isoprene units.
• C. Count the number of double bonds to determine the number of isoprene units.
• D. Count the number of oxygen atoms to determine the number of isoprene units.

Answer: (B)