The probability density function of a random variable X is $$f(x) = \frac{\pi}{10} \sin \frac{\pi x}{5}; 0 \leq x \leq 5$$. The first quartile of X is:

A

$$\frac{10}{3}$$

B

$$\frac{5}{3}$$

C

$$\frac{1}{5}$$

D

$$\frac{5}{2}$$