For this question, we want to match the width of the smaller rectangle with the width of the larger rectangle, and we want to match the length of the smaller rectangle with the length of the larger rectangle.
Thus, we have two possible answers.
[tex] \frac{4}{8} = \frac{12}{24} [/tex]
OR
[tex] \frac{8}{4} = \frac{24}{12} [/tex]
Thus, B is our answer.