According to a recent magazine article, of those office employees who typically work 8 hours at the office each day but sometimes say that they will work at home on a particular day, 25 percent actually work less than one hour. At the same time, over 90 percent of those same office employees believe they are more productive working at home than working in their office.

The statements above, if true, best support which of the following conclusions about the office employees discussed in the article?

A) On average, the office employees working at home for a day work fewer hours than office employees working at the office.
B) 10 percent of the office employees are less productive working from home than working in their office.
C) At least 15 percent of the office employees do not define productivity exclusively in terms of the number of hours worked.
D) At least 25 percent of the office employees can complete the same amount of work in one hour at home as in 8 hours at the office.
E) Some of the office employees make statements regarding their productivity that are not in fact true.

In order to understand this, we can assume that we have 100 workers in a company. 25% of these work less than an hour. That would equal 25 employees who work less than an hour when working from home.

Now, we also know that 90% of the employees in the company believe they are productive. This would be >90 employees.

If we assume that 90 employees believe themselves to be productive, that leaves 10 who do not believe themselves to be productive. If we think that these 10 belong to the 25 who work less than an hour, this means that at least 15 people in that group do think that they are being productive even when they are only working for an hour.

Therefore, at least 15 percent of the office employees do not define productivity exclusively in terms of the number of hours worked.