Why Did the Two Shawnee Brothers, Tecumseh and the Prophet

Why did the two Shawnee brothers, Tecumseh and the Prophet, tour the Old Northwest (in Ohio and Michigan) and the South (Georgia) in the early 1800s?

A) To promote cordial relations between Native Americans and the American settlers
B) To aid Meriwether Lewis and William Clark in their exploratory mission to the Pacific
C) To coerce natives into accepting European and American habits
D) To unite Native American nations to resist the perpetual encroachment of American settlers
E) To explore the nation and give exploratory feedback to the American settlers