Joe writes an expression $\frac59\times\frac9{13}\times\frac{13}{17}\cdots $ Following the pattern, he writes the expression with $\frac{45}{49}$ as the multiplier in the middle. What is the result of the expression? 
选项为:A:$\frac5{49}$  B:$\frac5{89}$  C:$\frac5{17}$  D:$\frac1{31}$  E:$\frac5{81}$  请回答其中一个选项.