The vertices A, B, C and D of a quadrilateral ABCD lie on a circle. $$\angle$$A is thrice $$\angle$$C and $$\angle$$D is twice $$\angle$$B. What is the difference between the measures of $$\angle$$B and $$\angle$$C ?

A

$$15^\circ$$

B

$$28^\circ$$

C

$$18^\circ$$

D

$$20^\circ$$