In the given figural series, the symbols placed at the four corners are changing in a fixed cyclic order.
If we observe the first four figures carefully, the corner symbols move one step forward in every next figure.
So, to obtain the missing figure, the same movement must continue.
The symbols at the four corners of the missing figure should therefore come in the next cyclic arrangement.
Also, the central symbol changes step by step.
The central symbol in the missing figure should be:
\[
\#.
\]
The direction of the inner triangular part also alternates from one figure to the next.
Thus, after observing the movement of the corner symbols, the central symbol, and the triangle direction, the figure that correctly continues the pattern is:
\[
\text{Option 2}.
\]
Therefore, the correct answer is option (B).