Final answer:
The female teacher's harsh behavior towards attractive girls is best described by Countertransference, where her unresolved feelings are projected onto the students.
Step-by-step explanation:
The behavior of the female teacher who is being overly harsh with attractive girls in her class can be best described by the term 'Countertransference'. This term is used in psychology to denote a scenario where a therapist or, in this case, a teacher, projects their own unresolved feelings onto their patients or students.
In the context of the question, because the teacher was never told she was attractive growing up, she may be projecting her insecurities or resentment onto her students. It's important to note that this concept is different from Projection, which refers to an individual attributing their own unwanted thoughts or feelings onto someone else. While Countertransference stems from the caretaker or professional's relationship with the client or student, Projection is a more broad defense mechanism applied in various interpersonal contexts.