已知集合 $A=\{x \mid 2 x-9 < 0\}, B=\left\{x \mid y=\frac{\ln (x-1)}{x-3}\right\}$, 则 $A$ I $B=$
A. $(1,3) \mathrm{U}\left(3, \frac{9}{2}\right)$
B. $[1,3) \mathrm{U}\left(3, \frac{9}{2}\right)$
C. $\left(1, \frac{9}{2}\right)$
D. $\left[1, \frac{9}{2}\right)$