Answer:
The correct option is X.
Step-by-step explanation:
From the given figure it is clear that:
1. Pyramid has 4 congruent triangles and a square base.
2. Color of 2 triangles is blue and another two triangles have black and white lines.
3. Triangles with same color or same design can't be on the opposite sides.
Option W is incorrect because it contains 3 blue triangles.
Options Y and Z are incorrect because triangles with same color or same design are on the opposite sides.
Only option X fulfill the above condition.
Therefore the correct option is X.
