212:436::560:?	Choose the correct choice from the following answers.
A) 786  B) 682  C) 784  D) 688  E) 622
2+2= 
<gadget id="calculator">2+2</gadget>
<output>4</output>
4   1+2= 
<gadget id="calculator">1+2</gadget>
<output>3</output>
3   2+4= 
<gadget id="calculator">2+4</gadget>
<output>6</output>
6   like that,   5+2= 
<gadget id="calculator">5+2</gadget>
<output>7</output>
7   6+2= 
<gadget id="calculator">6+2</gadget>
<output>8</output>
8   0+4= 
<gadget id="calculator">0+4</gadget>
<output>4</output>
4   answer 784
<result>C</result>
212:436::560:?