In the Black-Scholes Model, the Symbol $\sigma$ " Is Used to Represent the Standard Deviation of The

In the Black-Scholes model, the symbol " $\sigma$ " is used to represent the standard deviation of the:

A) option premium on a call with a specified exercise price.
B) rate of return on the underlying asset.
C) volatility of the risk-free rate of return.
D) rate of return on a risk-free asset.
E) option premium on a put with a specified exercise price.