Chọn câu đúng. Nếu a/b=c/d thì: (5a+3b)/(5a-3b)=(5c+3d)/(5c+3d)

A. $\frac{5a+3b}{5a-3b}=\frac{5c+3d}{5c+3d}$

B. $\frac{5a-3b}{5a-3b}=\frac{5c+3d}{5c-3d}$

C. $\frac{5a-3b}{5a-3b}=\frac{5c+3d}{5c-3d}$

D. $\frac{5a+3b}{5a-3b}=\frac{5c+3d}{5c-3d}$