The only possible option for food contamination is option C, where the person handling the food can contaminate the food depending on the disease that is present and how it is exposed to food. As for the other options, they are valid methodologies to avoid possible contamination of food, since it is short nails to facilitate washing, the replacement of gloves by performing different tasks or drinking liquids from a closed glass with sorbet.
Why do people tend to believe nonverbal messages even when they contradict verbal messages? Nonverbal behaviors are completely involuntary and reflect people's true states. People will only attempt to control their nonverbal behavior when they are lying.