Answer:
stimulus generalization, classical
Step-by-step explanation:
When a biologically potent stimulus is combined with a stimulus which was previously neutral it results in a learning process called classical conditioning. This affects in the person having the same reaction when experiencing something similar to the conditioned stimulus.
Here, Anna was attacked by a parakeet when she was three years old. So, now she fears everything that flies. Here the conditioned stimulus is anything that flies. This stimulus has been generalized in her mind. She now thinks that anything that flies will hurt her.