Critical Reasoning (CR) | An ancient scripture, about 3500 years old, was deciphered by experts

Which of the following best completes the passage below?

An ancient scripture, about 3500 years old, was deciphered by experts revealing it to be the account of a barter between two tribes. Verified by concurring evidence, the account describes how the Ngebono tribe promised military assistance in exchange for 200 musical instruments, believed to be vital accessories for tribal ceremonies, which were supplied by the Vergiba tribe. However, it has been proven that the latter tribe did not have