Based on the liquid’s courses, we must identify which cup will fill first by examining the image. Looking at the layout of the pipes that lead to each cup, it seems like a lot of the routes are clogged or impeded.
The way to cup 1 is not accessible. Moreover, the way to cup 2 is blocked. Cup 4’s passage is stopped.
Cups 5, 6, and 7 have lengthy or blocked pathways, and they are all found in branches farther down the system.
Cup 3 will fill first because it is the first to have no obstructions or blockages in its course.
Thus, Cup 3 is the response.