Research Has Shown That Four-Year-Old African-American Boys Are Suspended and Expelled

Research has shown that four-year-old African-American boys are suspended and expelled more often than any other race or gender, regardless of the race of the teacher. The reasons most often given are that they just can't sit still and control their bodies. This is an example of

A) age stereotype.
B) recency effect.
C) halo effect.
D) casual attribution.
E) implicit bias.