Final answer:
Casey may not have heard or intentionally ignored Margaret when she called his name.
Step-by-step explanation:
Communication is the process of exchanging information, ideas, thoughts, and feelings between individuals or groups. Effective communication is essential for understanding, collaboration, and the functioning of societies.
Casey did not answer Margaret when she called his name because he may not have heard her or he may have intentionally ignored her. The provided passages do not give a specific reason for Casey's lack of response, but it is possible that Casey had his own reasons for not answering.