In the figure shown, $AC = 2$ and $BD = DC = 1.$ What is the measure of angle $ABD?$

In the figure shown, $AC = 2$ and $BD = DC = 1.$ What is the measure of angle $ABD?$

A. $15^{\circ}$
B. $20^{\circ}$
C. $30^{\circ}$
D. $40^{\circ}$
E. $45^{\circ}$

Answer: C

Source: Official Guide

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