In the question provided, select a figure from amongst the four alternatives,…

Concept: A figure-completion grid built as a 2×2 block is completed by applying the block's own construction rule to the missing cell — here, left-right mirror symmetry about the vertical mid-line, so each quadrant on the right must reproduce the quadrant on its left, flipped horizontally.

Application: The top-left and top-right quadrants of figure (X) confirm this rule: the diagonal, the curve, and the fan of lines in the top-left reappear in the top-right, flipped left to right. Apply the same reflection to the bottom-left quadrant, which shows a long diagonal running toward the upper-right area, a curved arc, and a fan of lines that meets the lower edge in a narrow wedge, all crossing near the centre in a star-like pattern. Reflecting it horizontally gives a bottom-right quadrant whose diagonal instead runs toward the upper-left area, whose arc curves the opposite way, and whose wedge and connecting lines converge at the bottom-right corner instead. Figure (1) reproduces this reflected line-structure exactly — the same star-like crossing position, the same single wedge line meeting the bottom-right corner, and the same diagonal orientation.

Cross-check: The fully assembled reference figure below shows this same left-right mirror symmetry holding across all four quadrants, confirming the rule. Checking line-for-line against the remaining figures rules them out:

• Figure (2) adds one extra connecting segment near the centre that the true reflection does not produce.

• Figure (3) leaves a large part of the square blank, with the crossing lines confined to only the left column and a small triangle, rather than carrying the mirrored pattern across the whole square.

• Figure (4) has its lines converging at the bottom-centre with extra triangular sections across the full width, rather than converging at the bottom-right corner as the reflection requires.

Answer: figure (1).