Considering the ending of the story, the plot structure of “the circuit” most resembles a

biblical story
circle
pyramid

I believe the correct answer is circle.
The story has a cyclical structure, meaning that it begins in the same way it ends. In this story, the boy Panchito, lives with his family and they are very poor. They have to move a lot in search of work and some money. However, at some point Panchito gets to go to school and make friends. He goes home to tell his family some great news only to find his things packed because his family is ready to move again. So, it's a never-ending vicious circle of moving and not being able to settle down anywhere.