In 1801, a Blackfoot chief named Ac Ko Mok Ki drew a finely detailed map of the Upper Missouri region. This work demonstrates a vast amount of topographic knowledge, as the map features specific names of mountains and rivers, as well as the first-known sketch of the drainage network of the Missouri River. The map is especially notable because Ac Ko Mok Ki also included details about the numerous tribes that lived in the area.

Which choice best describes the function of the underlined sentence in the text as a whole?

Question

Accepted Answer

It identifies some reasons why the map is impressive.

Answer

It emphasizes Ac Ko Mok Ki's desire to represent other tribes on the map.

Answer

It explains how Ac Ko Mok Ki developed an interest in mapmaking.

Answer

It details how the map was used for hunting and trading purposes.