Question

Why does Neiterkob’s daughter most likely tell the myth "The Beginnings of the Maasai”?

to entertain the reader with the fantastic setting of where the Maasai live
to persuade the reader to adopt the Maasai’s affection for the sky god
to explain to the reader the origin of Maasai culture
to impress the reader with the history of the Maasai

Answer 1

to explain to the reader the origin of Maasai culture

Reason: origin myths like this typically describe how a people, their customs, and beliefs began (e.g., relationship with the sky god, why they herd cattle), rather than merely entertaining, persuading readers to convert, or impressing with historical facts.