5,9,18,30,50,__
Choose the correct choice from the following options:
A) 79  B) 80  C) 81  D) 82  E) 83
(9+5) +4= 
<gadget id="calculator">(9+5) +4</gadget>
<output>18</output>
18   (16+9) +5= 
<gadget id="calculator">(16+9) +5</gadget>
<output>30</output>
30   (28+16)+6= 
<gadget id="calculator">(28+16)+6</gadget>
<output>50</output>
50   (48+28)+7= 
<gadget id="calculator">(48+28)+7</gadget>
<output>83</output>
83   ANSW83R:83
<result>E</result>
5,9,18,30,50,__