A box contain 2 white and 3 blue identical balls. If two balls are picked at random, one after the other, without replacement, what is the probability of picking two balls of different colours?

A.
(frac{5}{25}) 
B.
(frac{7}{20}) 
C.
(frac{3}{5}) 
D.
(frac{2}{3}) 
E.
(frac{5}{6})