Here's why:
* Cultural anthropology focuses on understanding the diverse cultures of people around the world. This includes studying their beliefs, practices, social structures, languages, and how these elements shape their lives.
* Beowulf is a prime example of a cultural artifact that provides insights into Anglo-Saxon society. By analyzing the poem's themes of heroism, honor, loyalty, and the relationship between humans and monsters, we can gain a deeper understanding of the values and worldview of the Anglo-Saxons.
While other branches of anthropology might be tangentially involved (like archaeology for studying Anglo-Saxon artifacts or linguistic anthropology for analyzing the language of the poem), the focus on the cultural context and meaning of the story places it firmly within the realm of cultural anthropology.