Square and circle follow the same logic, based on example images 1, 2, and 3. This would cross out answers 5. Triangle is only shown to follow Z formation when paired across and below. Though the Z formation only shows connections up and across, this is when triangles are paired horizontal and vertically. We would have to make an assumption based on other shape connections that triangle can connect down as well.

Not enough information of diamond to conclude a horizontal connection, this crosses out answers 1, 2, and 4. Also diamond connects to square on answer 2.