Question 39: Which of the following can be inferred from the passage? A. There are certain rules that ensure the effectiveness of shift work...

Question 39: Which of the following can be inferred from the passage?

A. There are certain rules that ensure the effectiveness of shift work.

B. Shift work doesn’t allow employees to work efficiently.

C. Shift work is very common in all age groups.

D. the night shift is among the most common causes of sleep problems.