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Central Angles and Arcs

ACTMAT-YKE1TN

In Circle O below, $ {\overline { AD } } $ and $ {\overline { BE }} $ are diameters, and $ {\overline {OC}} $ is a radius.

If $ m{\angle }AOB = 47°$ and $ m{\angle }BOC = 78°$, what is the measure of arc DC, in degrees?

A

$43°$

B

$47°$

C

$51°$

D

$55°$

E

$65°$