During Her Childhood, Erin Enjoyed Wonderful Relationships with Her Grandparents

During her childhood, Erin enjoyed wonderful relationships with her grandparents and elderly aunts and uncles. At her first job at a nursing home, Erin expected the residents to all be kind and gentle. Erin is categorizing people into groups based on generalized characteristics instead of recognizing individual differences. This is known as

A) perception checking.
B) impression management.
C) appraising.
D) stereotyping.