The number of purple cupcakes is $\frac{32}{56}$ the number of pink cupcakes. There were $49$ pink cupcakes. What is the ratio of the number of pink cupcakes to purple cupcakes? 
选项为:A:$4:7$  B:$7:4$  C:$4:11$  D:$7:11$  请回答其中一个选项.