$26)$ When the returns of an option and stock are perfectly correlated as in a two$-$state binomial option model, the hedge ratio must be equal to the ratio of $.$

A$)$ the range of the option outcomes to the range of the stock outcomes

B$)$ the range of the stock outcomes to the range of the option outcomes

C$)$ the standard deviation of the option returns to the standard deviation of the stock returns

D$)$ the standard deviation of the stock returns to the standard deviation of the option returns

Expalin why A is the correct option.