Question

why are vaping and eating in a food preparation area prohibited?
to ensure employee safety
to ensure employees are staying on task
to avoid excessive handwashing
to prevent contamination

Explanation:

Vaping and eating in food - prep areas can introduce foreign substances like saliva, particles from vapes, and germs into food, leading to contamination. Employee safety, staying on - task, and handwashing are not the main reasons for the prohibition.

Answer:

to prevent contamination