Solution
The pattern followed is that the numbers are alternatively multiplied by '4' and $$'\frac{1}{2}'$$
43 $$\times4$$ = 172
172 $$\times\frac{1}{2}$$ = 86
86 $$\times4$$ = 344
344 $$\times\frac{1}{2}$$ = 172
=> Ans - (B)
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