The answer is C.
Stephen Austin was granted hundreds of acres by the Mexican government of the time so as to settle Texas.
American immigrants didn't like Mexican laws and rule, so they rebelled.
They were defeated by then president Anonio Lopez de Santa Anna upon rebellion at the Battle of the Alamo, an old Spanish mission.
Later on Texans joined forces and defeated Santa Anna's army, forming their own nation.
Many Americans wanted Texas to join but were sensing the impending danger of admitting it as a slave state or free one.
In the end, it was admitted into the Union as a slave state.
