Which of the following items is most likely to form a simple linear relationship with the number of gene-duplication events, when placed as the label on the vertical axis of the following graph? 
Definitions:
Black-Scholes Option
A mathematical model used to price European options and derivatives by estimating the variation over time of financial instruments.
Implied Volatility
The market's forecast of a likely movement in a security's price, often derived from the price of its options.
Binomial Option Model
A mathematical model used to price options by breaking down the option's life into discrete time intervals and calculating the value at each step.
Interest Rate
The percentage of a sum of money charged for its use, typically expressed as an annual percentage on a loan or investment.
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