Final answer:
A manager may allow an employee to chew gum only during a break, as other circumstances may compromise hygiene or professional presentation.
Step-by-step explanation:
In a professional setting, an employee chewing gum could be deemed inappropriate, especially if the employee interacts with customers or is in a role where hygiene and presentation are critical. However, if the manager decides to allow chewing gum, the most likely circumstance would be during a break. This is because breaks are personal time where employees are not actively representing the business to customers. Therefore, option A) During a break is the most suitable answer. Allowing gum chewing in the kitchen or because it is sugar-free can raise hygiene issues and is usually against health codes and company policies. Gum chewing is generally not appropriate in professional settings where it might be seen by customers or where it could compromise the cleanliness of the work environment. Therefore, options B, C, and D would not be good circumstances to allow an employee to chew gum.