A pattern is made of equal pentagons, which of the tiles below, when placed in the central hole, will form a loop that intersects itself. For this problem, we should note that all the tiles are upside down and rotated by 180 degrees. From the pattern, we see that exactly one side of the pentagon does not have a line crossing it. Therefore, only on an edge of choice C does the corresponding side not have a line crossing If we insert tile C, we can see that it forms a self-intersecting loop.

pentagon

pattern

tiles

self-intersecting

loop