已知$$a\times \frac{5}{4}=b\times \frac{6}{7}=c\times \frac{4}{9}=d\times \frac{8}{8}$$，并且$$a$$、$$b$$、$$c$$、$$d$$都不等于零，那么$$a$$、$$b$$、$$c$$、$$d$$四个数的大小关系是(  ) 
选项为:A:$$a\textgreater d\textgreater b\textgreater c$$  B:$$b\textgreater c\textgreater d\textgreater a$$  C:$$c\textgreater b\textgreater d\textgreater a$$  D:$$c\textgreater d\textgreater b\textgreater a$$  请回答其中一个选项.