SAT Question 589cd7a6: Probability And Conditional Probability answer and explanation with Desmos solution

Choice C is correct. If a token is selected at random from the box, the probability of selecting a token that is brown is equal to the number of tokens that are brown divided by the total number of tokens in the box. Since there are $13$ brown tokens and $104$ total tokens in the box, the probability of selecting a token that is brown is $\frac{13}{104}$, or $\frac{1}{8}$.