This question is primarily testing IDIOMS and meaning.

Among the Tsonga, a Bantu-speaking group of tribes in southeastern Africa, dance teams represent their own chief at the court of each other, providing entertainment in return for food, drink, and lodging.

(A) the court of each other, providing entertainment in return for
- "the court of each other" is not idiomatic

(B) the court of another and provide entertainment in return for
- no issues

(C) the court of the other, so as to provide entertainment as a return on
- if we say "dance teams" plural, then "the other" doesn't make sense - it implies that there is only one other court
- "return on" is not the correct idiom in this context. When something is exchanged, we say "in return for."

(D) each other's court, entertainment being provided in return for
- "each other's court" could work here, but...
- "entertainment being provided" is ambiguous. Who is providing it to whom?

(E) another's court and provide entertainment as a return on
- same "return on" issue as in C

The correct answer is B.