A company's personnel director surveyed employees about

Premise: A company's personnel director surveyed employees about their satisfaction with the company's system for awarding employee performance ratings.
Conclusion: The personnel director concluded from the survey data that the company's best-performing employees liked the system.

Option A - Incorrect:
This is not the personnel director's assumption because the survey was carried out to know the satisfaction of the company's employees and not to make a comparison between the current rating system and other rating systems.

Option B - Correct:
The conclusion was based on the fact that employees who received high ratings were very satisfied with the system. From this data, we know that the company's best-performing employees liked the system which brought about the correlation that the company's best-performing employees received high ratings.

Option C - Incorrect:
There is no fact in the passage to back up this option because the argument is not concerned about employees who received low ratings. Hence, we don't know the dissatisfaction of employees who received low ratings.

Option D - Incorrect:
The survey data indicated that employees who received high ratings were very satisfied with the system. The word "will" stated in this option, thus, invalidates this claim.

Option E - Incorrect:
The argument is concerned about the satisfaction of the employees, we can't justify any statement of motivation in the passage. Therefore, this option is irrelevant.