5,9,18,31,52,__ Choose the correct choice from the following: A) 79 B) 80 C) 86 D) 82 E) 83
(9+5) +4= 
<gadget id="calculator">(9+5) +4</gadget>
<output>18</output>
18   (16+9) +6= 
<gadget id="calculator">(16+9) +6</gadget>
<output>31</output>
31   (28+16)+8= 
<gadget id="calculator">(28+16)+8</gadget>
<output>52</output>
52   (48+28)+10= 
<gadget id="calculator">(48+28)+10</gadget>
<output>86</output>
86   ANSWER:86
<result>C</result>
5,9,18,31,52,__