Mr. Reber thought Ms. Bissett was the ideal employee. Bissett was an impressive person and attended all social functions of the company. However, during the past year she had trouble meeting sales quotas. Nevertheless, on her performance appraisal, Reber rated Bissett as one of the top sales people. On hearing this, other sales people complained that Reber must guard against in rating Bissett.

D) overemphasizing some issues and underemphasizing others

Explanation:

Apparently Ms. Bisset has a lot of good qualities as an employee and human being, but her supervisor, Mr. Reber is behaving as if all her actions were great, when they are not. Generally performance appraisals do not focus on only one activity or performance measurement, it is more like a weighted appraisal. But that doesn't mean you should focus only on the tasks that you want an forget about the rest.

It is very uncommon that someone will do great n every single aspect or category, e.g. good salespeople are very competitive and depending on how sales are distributed (by sector, region or not differentiated at all) may not be very social or hopeful with their coworkers. People who like accounting are boring, no one is perfect.

The problem here is that Mr. Reber likes Ms. Bisset a little too much, and he is considering only her good qualities as important, when a salesperson can have many defects, but he/she must be able to sell. It's like a pitcher that cannot pitch, they are useless for that position. Maybe she could work somewhere else in the company that better fits her abilities.