Millie feels sick every time she travels by air. she associates flying with physical illness and, as a result, hates air travel. she also finds it difficult to watch movies with airplanes or read books about airplanes because they make her feel unwell. in this scenario, millie is demonstrating learning through:

The correct answer is classical conditioning (CC).

Classical conditioning (CC) refers to process of learning through association, where two stimuli (in this case airplanes and getting sick) are repeatedly combined, leading to a response that is created in the person (avoidance of airplanes in general, and also in movies and books). CC involves conditioned and unconditioned stimuli to evoke a learned response.