28) A

Argument: People are different in whether they are more alert in morning or at nigh due to different levels of melatonin. Therefore, employers should allow flexible working hours to accommodate people’s sleep patterns.

A – Correct
It the causation was changed. The text suggests melatonin decides whether a person is a night owl or a morning lark. However, if it were true that sleeping patterns affect the level of melatonin, then this would weaken the argument.

B – Wrong
This supports there argument that melatonin tablets can affect a person’s sleeping pattern.

C – Wrong
No mention of health.

D – Wrong
The text does not focus on the amount we sleep. It focuses on when we sleep during the day.

E – Wrong
Again, nothing relevant to owl and lark behaviour. So this is wrong.

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