If the fraction $$\frac{19}{21}, \frac{21}{25}, \frac{25}{29}, \frac{29}{31}$$ and $$\frac{31}{37}$$ are arranged in the ascending order, then the largest fraction is

A

$$\frac{19}{21}$$

B

$$\frac{25}{29}$$

C

$$\frac{29}{31}$$

D

$$\frac{21}{25}$$