If n = 1, then 0 < x $\leq$ 4
when the value of n increases from 1 to infinity, the range of x approaches (1 < x $\leq$ 3).
So, the lower limit of x increases from almost 0 (to almost 1), while the higher limit decreases from 4 (to 3).
Thus, the lowest possible limit of x will be > 0 and the highest possible limit will be ≤ 4.
For all range of n, 0 < x $\leq$ 4
Hence,Option(B) 0 < x $\leq$ 4.