Correct : b

When a transparent sheet is folded along a dotted line, the portion on one side flips over onto the other side. Since the sheet is transparent, all markings remain visible — nothing disappears. The key rule is that the folded half appears as a mirror reflection across the fold line.
In this question the dotted line is vertical, so the right half of the sheet flips horizontally onto the left half. Any shape or marking on the right side gets reflected and overlaps with the left side. The resulting figure shows both the original left side markings and the mirrored right side markings superimposed together.
Options A, C, and D either misplace the reflected shape or incorrectly orient the markings after folding. Only option B correctly shows the mirrored overlap with the right side''s markings reflected horizontally onto the left, which is exactly what happens when a transparent sheet is folded along a vertical line.
Correct answer: B