If you managed a manufacturing plant that ran three rotating shifts, what could you do to help your employees remain in a more normal biological rhythm?

A) keep the lighting soft to mimic the normal amount of light present at night
B) provide machines with choices of many beverages with caffeine
C) use a three-week rotational schedule
D) provide regular vitamin supplements, especially vitamins C and D

A three-week rotational schedule would allow employees to have a regular sleep pattern, which would help them remain in a more normal biological rhythm. Soft lighting, caffeine, and vitamin supplements may have some benefits, but they would not be as effective as a regular sleep pattern for ensuring employees' well-being. Additionally, providing machines with choices of many beverages with caffeine may negatively affect employees' sleeping patterns.