Answer:
a.Cheyenne
Step-by-step explanation:
Despite the invasion of George Armstrong Custer in 1868 on Cheyenne nation. The people of Cheyenne were originally peaceful about the whole issue.
However, around 1874 to 1875, they were involved in the widespread results of the southern Plains tribe.
As a result, the Cheyenne nation got involved in a larger battle that defeats Custer. The battle was known as the Battle of the Little Bighorn.
Hence, in this case, the correct answer is CHEYENNE.