why is modern Texas culturally similar to the American South even though it is located in the Southwest?

A) People Migrating from the American South settle together and a maintained their traditions

B) Texas wish to become part of the Confederate forces so they were forced to adopt the culture of the group as well

C) German emigrant to migrated to Texas chose to adopt the customs of nearby states

D) The people of Texas worked to find a group which to belong and they adopted the customs of the American south

I think it's A or D