Black-Scholes-Merton model is a mathematical model for pricing options. To apply the Black-Scholes-Merton model to price a call option on an exchange, you need to know the current stock price, the strike price of the option, the risk free rate, time to expiration, and volatility of the underlying stock. Once you have all these inputs, you can use the Black-Scholes-Merton formula to calculate the value of a call option.