What does it mean to "appall" someone?

To "appall" someone means to fill them with dismay or horror. This word conveys a strong emotional reaction, often in response to something shocking or upsetting. When someone is appalled, they experience a profound sense of alarm, disgust, or disapproval towards a situation or action that they perceive as wrong or troubling. In contrast, the other choices represent different emotional states, such as joy, confusion, or inspiration, which do not align with the negative feelings associated with being appalled. Thus, option C accurately captures the essence of the word in a way that showcases its intended emotional impact.