Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks from 44 to 50

Due to the nature of our business, it's sometimes necessary that our staff work at night. Night shifts can be particularly demanding on employee wellbeing and health. This can include disruption to the body clock, fatigue, sleeping difficulties, disturbed appetite and digestion, reliance on sedatives or stimulants, social and domestic problems and other symptoms of ill health. To combat this, we do not have employees on night shifts for extended periods. This is because workers’ bodies will just have started to adapt to the new pattern.

We find rotation shifts every two to three days are best for workers and weekly or fortnightly rotations are the least comfortable for workers. Forward-rotating programs (moving from morning to afternoon to night shifts) are better than backward-rotating ones in terms of sleep loss and tiredness.

If someone works at night, there are rules covering the hours they work. Night time working hours are usually between 11 p.m. and 6 a.m. – but this can be flexible and should be discussed between you and us. To qualify as night working, the night time period must be no more than 8 hours long and include the period between midnight and 5 a.m. Any of our staff under 18 years are not allowed to be night workers.

We must make sure that you don't work more than an average of 8 hours in a 24-hour period. By law, you can't opt out of this working limit. We must also keep records of any night workers’ working hours to prove they aren't exceeding night working limits, and we must keep the records for at least 2 years. These records can be inspected by you at any time on request.

Our usual limits and regulations for night workers do not apply to self-employed workers. This does not include agency workers, who are treated as normal workers with us.

If you agree to working at night for us, the agreement will be put in writing. If you are to begin working at night, we must perform a health assessment before you become a night worker and on a regular basis after that. Usually, this is just done with a questionnaire, which was created in collaboration with qualified health professionals. If there are any health questions regarding your health and night work, we will offer you a follow-up examination by a health professional if you still wish to work nights.

(Adapted from IELTS 5 practice Tests – General Set 3 - Tests No. 11-15 (High Scorer’s Choise) – page 109)

Which of the following could best serve as the topic of the passage?