According to the text, language serves what primary purpose?

Language primarily serves to express human effort and history as it acts as a fundamental tool for conveying experiences, emotions, and cultural narratives across generations. This usage reflects our shared existence and understanding of the world, allowing individuals and communities to document and share their stories, values, and insights. Through language, people can articulate their struggles, achievements, and aspirations, creating a rich tapestry of collective human experience that incorporates both personal and historical contexts.

The other answer options, while they represent valid uses of language, do not encapsulate its overarching purpose as effectively as the selected option. Communicating formal policies could be seen as a specific function of language within organizations or governments. Illustrating complex ideas, although essential in educational settings, is more about the technique of communication rather than its primary purpose. Similarly, while entertaining and engaging audiences is a significant aspect of language, it is often considered a secondary function that stems from the broader capacity of language to express human experiences. Thus, expressing human effort and history captures the essence of why language is such a crucial element of human society.