If 7^k = 2, then 7^(4k+2) =  Select the correct option.
A) 729  B) 754  C) 784  D) 783  E) 108
7^k=2   7^4k=2^4   7^4k=16   7^(4k+2)   =7^4k*7^2   =16*49= 
<gadget id="calculator">16*49</gadget>
<output>784</output>
784   Answer: 784
<result>C</result>
If 7^k = 2, then 7^(4k+2) =