A 25% increase in the price of public transportation leads to a 15% increase in the quantity demanded of bicycles. Calculate the cross-price elasticity and evaluate the relationship between public transportation and bicycles.

• A. -0.6, indicating they are complements.
• B. 0.6, indicating they are substitutes.
• C. -1.67, indicating they are complements.
• D. 1.67, indicating they are substitutes.

Answer: (B)