Which of the following is a proportional relationship? SELECT ALL THAT APPLY

A)
[tex] \frac{2}{3} = \frac{8}{12} [/tex]
B)
[tex] \frac{6}{7} = \frac{12}{13} [/tex]

C)
[tex] \frac{15}{20} = \frac{9}{12} [/tex]

D) None of the above​