A graph shows a correlation between ice cream sales and drowning incidents. What potential pitfalls might this graph have, and how can they be addressed?

• A. No pitfalls; the graph is accurate.
• B. Omitted variable bias; consider the effect of ice cream flavor.
• C. Omitted variable bias; consider the effect of temperature.
• D. Reverse causality; ice cream sales cause drowning.

Answer: (C)