Answer:
The representativeness heuristic.
Step-by-step explanation:
As shown in the example given, the representativeness heuristic is a process in which an individual compares the similarity of certain objects and organizes them according their category, similitudes, etc. In this case, being a student in a classroom, one would expect that if a person has a certain outfit and age to be a teacher, and enters the classroom, the faster assumption would be to think of her as a teacher.