The internal angles of quadrilateral A B C D form an arithmetic progression. Triangles A B D and D C B are similar with \angle D B A=\angle D C B and \angle A D B=\angle C B D. Moreover, the angles in each of these two triangles also form an arithmetic progression. In degrees, what is the largest possible sum of the two largest angles of A B C D ?
Answer Choices
A. 210
B. 220
C. 230
D. 240
E. 250