Which best describes why the author has the mother and son in “Borders” sleep in the car for two days?

to show their poverty

to show the bureaucracy of the border patrol

to show tension among the characters in the rising action of the story

to show the depth of the mother’s willingness to stand up for her heritage

None of the given options accurately describes the reason why the author has the mother and son in "Borders" sleep in the car for two days.