In the given series, the movement and pattern of shapes are important. In the first figure, the direction of arrows is downward. In the second figure, the shape inside rotates, and the arrows are pointing to the right. Continuing this pattern, we expect the third figure to have a rotation of the inner shape with the arrow pointing upwards.
Among the given options, figure (B) correctly completes the pattern with the arrow pointing upwards and the shape rotated as per the sequence.
Conclusion: Thus, the correct answer is (B) b