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Critical Reasoning: Conclusion Strengthening Questions

The National Train Company of Country X has decided to offer its employees a classical music appreciation course free of charge in order to increase productivity. The decision was reached after a study was published confirming the positive effects of classical music on the human psyche: facilitating improved stress management and inducing a feeling of tranquility.  

Which of the following, if true, most seriously strengthens the National Train Company's conclusion?

Incorrect.

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Putting employees to sleep weakens the conclusion that a classical music appreciation course will improve the employees work.

Incorrect.

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The cost of the music appreciation course is a consideration against it.

Incorrect.

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If the music appreciation courses affect only one in five, the conclusion that a classical music appreciation course will improve the employees work is weakened.

Incorrect.

[[snippet]]

The popularity of classical music appreciation courses is irrelevant to the conclusion that a classical music appreciation course will improve the employees work.

Right you are.

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Lowering the average days of sick leave strengthens the conclusion that a classical music appreciation course will improve the employees work.

A newspaper article appearing in the science section states that classical music is more conducive to sleep than Pop, Rock and Roll and Rhythm & Blues.
The cost of the classical music appreciation course, per student, comes to 10% of the average monthly salary paid in the National Train Company.
A survey handed to students in 10 separate music appreciation courses shows that music appreciation courses affect the musical tastes of only 20% of participants.
Classical music appreciation courses are preferred by employees of large companies over Pop or House music appreciation courses.
Classical music has been shown to have a positive effect on the digestive system, thus lowering the average days of sick leave among those who listen to it.