Rearrange the parts of the sentence in correct order. Research shows

P. that medium-skilled employees who work

Q. in front of a computer and work beyond

R. 4.6 effective hours a day produce smaller

S. quantities of output per hour due to fatigue

PQRS

The correct answer is Option (4) - PQRS

The correct order of the sentences is PQRS.

• P. Research shows This sentence introduces the topic of the paragraph, which is a study that found that medium-skilled employees who work beyond 4.6 effective hours a day produce smaller quantities of output per hour due to fatigue.
• Q. that medium-skilled employees who work This sentence states the specific group of people that the study was conducted on.
• R. in front of a computer and work beyond This sentence states the specific conditions under which the study was conducted.
• S. 4.6 effective hours a day produce smaller This sentence states the main finding of the study, which is that medium-skilled employees who work beyond 4.6 effective hours a day produce smaller quantities of output per hour due to fatigue.