Which answer figure will complete the pattern in the question figure?

Let us analyze the symmetry of the $2\times 2$ quadrant matrix:
1. Each completed quadrant contains a small rectangular block placed along its outermost corner. The missing quadrant is the bottom-left one, so it must contain a small rectangular block at its bottom-left corner.
2. The curved arcs meet at the center to maintain structural continuity across the quadrants.

Looking at the options, Figure A perfectly satisfies both conditions (correct arc orientation and the rectangular block at the bottom-left corner).