In the given problem figures, designs are getting changed according to different patterns. The changes in figure 5 to 6 will happen according to figure 1 to 2.

The pattern for figure 1 to 2: Lower-most letters are shifting to right and rightmost letter is coming to the leftmost position, star and square will exchange their positions, C and S will exchange their positions and the remaining 2 letters will also exchange their positions.

The same pattern will be followed for figure 5 to 6 and hence, answer will be D