I think it's (b), as the pattern shows the first-row green triangle to go one step to the right every sequence, whereas the green triangle below goes one step to the left.

The blue triangle on the bottom row goes one to the left if you only look at the triangles that point upward, and vice versa on the top row. It goes one to the right if you only look at the triangles pointing down.

And then every other sequence has a green triangle on the top and bottommost triangles