$\begin{array}{1 1}(A)\;B=\{x : x=3^n,n\in N\;and\;n < 9\}\\(B)\;B=\{x : x=2^n,n\in N\;and\;n < 6\}\\(C)\;B=\{x : x=4^n,n\in N\;and\;n < 16\}\\(D)\;B=\{x : x=1^n,n\in N\;and\;n < 8\}\end{array} $

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