Question

before you leave the science room, you should..
antes de salir de la sala de ciencias, debe

○ all of the above/ todas las anteriores
○ clean your work area and equipment/ limpiar su área de trabajo y equipo
○ wash your hands with soap and water/ lávate las manos con jabón y agua
○ return all equipment to the proper storage area/ devuelva todo el equipo al área de almacenamiento adecuada.

Explanation:

In a science room, the proper procedures before leaving typically include cleaning the work area and equipment, washing hands, and returning equipment to proper storage. So "all of the above" is the correct choice as it encompasses all these necessary actions.

Answer:

A. all of the above/ Todas las anteriores