El alumno mira el para ver la hora. pupitre cuaderno reloj archivo

The right option that fills the blank is:

- El alumno mira el reloj para ver la hora.

Explanation:

The translation of the sentence is:

- The student looks at the clock to see the time.

The options that were not chosen in the text were: desk, notebook, and file, as you can see, in any of the other options provided you can see the time, there would be other means in which perhaps it could be seen (especially electronic) as cell phones, computers, and even television, but since the options do not include any of those mentioned, the only reasonable option is "reloj," which can be in English "watch" or "clock" depending on whether it is on an arm or placed on a wall.