$$\lim_{x \rightarrow 0}\left(\frac{e^{5x} - e^{3x}}{e^{4x} - e^{x}}\right) =$$

A

$$\frac{3}{2}$$

B

$$\frac{2}{3}$$

C

$$\frac{3}{4}$$

D

$$\frac{4}{3}$$