Which of the following is acceptable for an employee to drink from while working?

The choice of a cup that is enclosed with a lid and straw is acceptable for an employee to drink from while working because it minimizes the risk of spills and contamination in the workplace. This type of cup helps to maintain cleanliness and safety in food handling environments, which is essential to prevent any potential hazards, especially in settings like restaurants or food processing facilities.

Using a regular open cup increases the likelihood of spills and can lead to contamination of food or surfaces within the working area. A glass jar may not be practical due to its fragility and the potential risk of breakage, which poses a safety hazard. A bottle without a lid fails to provide any protection against spills and does not adhere to safety standards typically required in a professional setting. Thus, the option with the lid and straw is the most suitable choice for ensuring a clean and safe work environment.