A business is considering changing its work week structure. At present, employees work the standard Monday to Friday work week. The new structure would allow employees to choose which two days to claim as their weekend, opening up the option to work on Saturdays and Sundays.
The adoption of this plan would be most likely to decrease employees' productivity if the employees' job functions required them to __________.

A. work undisturbed for several hours at a time.
B. submit their work for weekly managerial appraisal.
C. work late hours.
D. collaborate on monthly group projects.
E. correspond with banks daily, which are usually closed on Sundays.

Source: http://www.gmatpracticequestions.com/
Difficulty Level: 650
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D can also be a potential correct answer right? If a number of people is needed to work together as a team, different work times would be a problem

Edited: Added the source and difficulty level.
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