2001 AMC 12 Problem 24

In \triangle ABC, \angle ABC=45^\circ. Point D is on \overline{BC} so that 2\cdot BD=CD and \angle DAB=15^\circ. Find \angle ACB.

\text{(A) }54^\circ \qquad \text{(B) }60^\circ \qquad \text{(C) }72^\circ \qquad \text{(D) }75^\circ \qquad \text{(E) }90^\circ

Full credit goes to MAA for authoring these problems. These problems were taken on the AOPS website.