Steve sells traffic signs and tape to municipalities. In his region he has a few affluent communities that order the best items. Carla has even more communities in her region that are affluent, and she sells even more items. If their supervisor does not use some adjustment factor to account for the differences in regions when evaluating the performance of the two workers, the evaluations will exhibit:

a) adverse impact.

b) halo effect.

c) recency effect.

d) opportunity bias.

e) global bias.