GAUSS8 2007 Problem 12

Past Contests GAUSS8 GAUSS (GR. 8) - 2007
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1

In the diagram, AD=BD=CD and \angle{BCA}=40^\circ. The size of \angle{BAC} is

Image

Answer Choices
A. 80^\circ
B. 120^\circ
C. 60^\circ
D. 90^\circ
E. 100^\circ