The most important reason for having food handlers wear hair restraints is to:
a) keep the food handlers’ hair neat and in place to instill customer confidence
b) avoid the need for having food handlers wash their hair daily
c) eliminate possibilities of debris falling into food handlers’ hair
d) prevent food handlers from contaminating their hands by touching their hair

The correct answer would be D, Prevent food handlers from contaminating their hands by touching their hair.

Explanation:

Food handlers are the people who handle food items with their hands. They are either involved in the production or in the presentation of food. They need to properly cover their hair. This is because of the fact that people usually touch their hair without thinking, unconsciously, and when they are making food for someone, then this unconsciousness may lead to food contamination. So food handlers are always required to wear proper hair caps. Also if their hair are not covered, any hair can fall into the food item and can make it contaminated and disgusted to be used by the customers. So to avoid such unhygienic acts, they are required to cover their hair.  

the answer is c prevention of weight gain. i got the same question.