Answer: is constant across exercise price and time to expiration

## Explanation **Analysis of Each Statement:** **Statement A: "is constant across exercise price and time to expiration"** - **Least accurate** - This is incorrect - In reality, implied volatility varies significantly across: - Different exercise prices (volatility smile/skew) - Different time to expiration (volatility term structure) - The Black-Scholes model assumes constant volatility, but real markets show volatility is not constant **Statement B: "may be used to revalue existing option positions over time"** - **Accurate** - Implied volatility can be used to mark-to-market option positions - As market conditions change, implied volatility helps determine current option values **Statement C: "makes it easier to understand the current market price of various risk exposures"** - **Accurate** - Implied volatility represents the market's consensus on future volatility - It helps traders understand the pricing of different risk exposures in the options market **Why Statement A is Least Accurate:** - Empirical evidence shows implied volatility is not constant - Volatility smile: Different strike prices have different implied volatilities - Volatility term structure: Different expiration dates have different implied volatilities - This variation reflects market expectations about future price movements and risk **Correct Answer: A** Statement A is least accurate because implied volatility is not constant across exercise prices and time to expiration in practice.

Author: LeetQuiz Editorial Team