Question

long hair in the lab must be...
el pelo largo en el laboratorio debe ser
○ tied back or kept entirely out of the way with a hair band, etc / atado hacia atrás o mantenido completamente fuera del camino con una banda para el cabello, etc.
○ held away from the experiment with one hand/ alejado del experimento con una mano
○ always neatly groomed/ siempre cuidadosamente arreglada
○ cut short/ acortar

Explanation:

In a laboratory setting, safety protocols require long hair to be secured to prevent it from interfering with experiments, catching fire, or getting contaminated. Tying it back or using a hair band to keep it out of the way is a standard safety measure. Holding it with one hand is impractical as hands are needed for experiments. Grooming neatness is not a safety - related lab requirement for long hair, and cutting hair short is not a mandatory rule (people can have long hair as long as it's secured).

Answer:

A. tied back or kept entirely out of the way with a hair band, etc / atado hacia atrás o mantenido completamente fuera del camino con una banda para el cabello, etc.