>>11240052Answer is obvious. Circles are connected to other objects by one edge, and objects with two or more vertices are connected to other objects by an edge at each vertex. The pattern would be even better if a teardrop shape were used instead of a circle.
Here we have a triangle, two semicircles, and a circle. The triangle must be connected by three edges, each semicircle by two, and the circle by one. The only visible choice that satisfies these conditions is 5.
