Identify the figure that will replace the question mark and complete the given…

Concept: In a figure-completion series, the master figure is built from several overlapping design layers — an outer arc/circle, an inner line motif (from overlapping polygons), and a small corner mark — arranged so each quadrant follows a fixed symmetry rule linking it to the other three. The missing quadrant must reproduce every one of these layers in the exact form the rule dictates, not just one matching feature on its own.

1. Look at the corner marks: the top-left and bottom-left quadrants both show the same reversed, script-like mark, while the top-right quadrant shows the letter 'S' — the left column repeats one mark and the right column repeats the other.

2. Since the missing quadrant sits in the bottom-right, in the same column as the top-right quadrant, the rule requires it to carry the letter 'S', not the reversed mark.

3. Now look at the line-work in the three visible quadrants: each shows one continuing arc of the outer circle crossed by a single diagonal line that passes through one small triangular peak (the corner of the inner square-and-diamond figure).

4. The missing quadrant must continue that same arc and repeat that same single diagonal-line-and-triangle motif — no extra lines, no doubled arc.

5. Compare every candidate panel against both requirements together: the corner mark AND the line motif must both match.

Cross-check: the reveal image above shows the completed master figure — its bottom-right quadrant combines the continuing arc, the single diagonal line through a small triangular peak, and the letter 'S', confirming both requirements at once.

• The panel with a wide, overlapping petal-shaped curve carries the reversed left-column mark, not the required 'S', and its curve does not match the arc-plus-diagonal-line-and-triangle motif.

• The panel with an extra crisscrossing fan of lines also carries the reversed left-column mark instead of 'S', and it adds lines beyond the simple arc-and-triangle motif.

• The panel with a doubled arc and extra crossing facets does show the correct 'S' mark, but its line-work has more crossings than the single diagonal line through one triangular peak that the rule requires.

• The panel with one continuing arc, a single diagonal line through a small triangular peak, and the letter 'S' satisfies both the corner-mark rule and the line-motif rule — it is the figure that completes the pattern.