The correct option is
C In the given pattern following points can be observed,
1. The number of triangles are increasing.
2. The triangles are added in straight position.
3. Each of the triangle gets rotated by quarter a turn (clock-wise)in the next image.
4. The colour of the triangle added will be either blue or pink. It will be blue if in the previous image traingle added is in pink colour and vice-versa.
So based on the above points the next image will have.
1. 5 triangles
2 The new triangle will be in straight position
3. Each of the triangle from third image will be rotated by quarter turn.
4. The colour of the new triangle added will be pink as the colour of the last triangle is blue in the previous image.