Tecumseh and Tenskwatawa were brothers who:
a. preached a militant message to Native Americans early in the nineteenth century.
b. were chiefs of adjacent tribes, the Shawnee and the Seneca.
c. fought beside Andrew Jackson at the Battle of New Orleans.
d. both died at the Battle of Tippecanoe.
e. differed on whether Indians or whites were more at fault for Native American
problems.

a) preached a militant message to Native Americans early in the nineteenth century.

Explanation:

Tecumseh and Tenskwatawa were brothers who led the most (relatively) successful resistance by the indigenous population against the advancement of white settlers. Tecumseh was a gifted leader and orator who was able to bring together different tribes and clans for their common cause against the advancement of the whites. Tenskwatawa was a religious leader known as ‘The Prophet’ and was the spiritual force behind their movement.

Tenskwatawa died in Argentine, Kansas, in 1836.

Tecumseh died on 5th of October 1813 in Chatham-Kent, Canada.

They didn't fight with Andrew Jackson at the battle of New Orleans

Tecumseh's confederation fought the United States during Tecumseh's War, but he was unsuccessful in getting the U.S. government to rescind the Treaty of Fort Wayne (1809) and other land-cession treaties. In 1811, as he travelled south to recruit more allies, his brother Tenskwatawa defended Prophetstown against William Henry Harrison's army at the Battle of Tippecanoe, but the Native Americans retreated from the field and the European Americans unearthed graves and burned Prophetstown.

the answer is c my brotha. c.   formed an alliance with the soviet union.