2,7,36,4,14,225,6,21,?	Options:
A) 475  B) 576  C) 676  D) 776  E) 876
2,7,(x)2, x+3=2+7= 
<gadget id="calculator">2+7</gadget>
<output>9</output>
9 x=6   4,14,(y)2 y+3=14+4= 
<gadget id="calculator">14+4</gadget>
<output>18</output>
18 y=15   6,21,(z)2 z+3=21+6= 
<gadget id="calculator">21+6</gadget>
<output>27</output>
27 z=24 answer=24*24= 
<gadget id="calculator">24*24</gadget>
<output>576</output>
576   ANSWER:576
<result>B</result>
2,7,36,4,14,225,6,21,?