Final answer:
Angela is voicing a stereotype, which is an oversimplified generalization about elderly people, by assuming Mrs. Avery will be slow to fill out forms due to her age.
Step-by-step explanation:
When Angela makes a comment about Mrs. Avery's age as she enters the veterinary clinic, she is expressing a form of age-based stereotyping. Stereotypes are oversimplified generalizations about groups of people that do not take individual differences into account. In this case, Angela is assuming that because Mrs. Avery is elderly, she will be slow in completing forms, which is a common ageist stereotype that elderly people are slow or incompetent. This does not necessarily mean Angela has acted upon this belief, which would be discrimination, or that she harbors negative feelings towards Mrs. Avery, which would be prejudice. Nor does it imply that Angela's statement is sarcastic. Hence, her comment is best described as stereotyping.