Which of the following answer-figure patterns can complete the series given in the question figures?

Let's trace the movement and transformation of elements from box to box:
1. The Triangle: Moves sequentially across the edges. In the third box, it is at the bottom-center. In the next step, it continues its clockwise/counter-clockwise directional path shifting towards the bottom-right or right edge.
2. The Shaded Circle: In Box 1 it is at the bottom-right, Box 2 at the bottom-left, Box 3 at the top-left. Following this anti-clockwise corner rotation pattern, in Box 4 it must move to the top-right corner.
3. Looking at the options where the shaded circle is in the top-right corner, options C and D satisfy this. Comparing C and D, the triangle is correctly placed vertically at the bottom-right or lower-right vertical alignment to complete the continuous cyclic shift. Hence, Option D fits perfectly.