I am not familiar with Centre College.
Trinity in San Antonio is a good school.
Trinity University Academics
San Antonio is nice, a fun city. I think this would be a great city to go to college in
San Antonio Texas visitor information
The weather there is nice during the school year. (Too hot in the summer.)
Austin College is in Sherman, Texas, population 35,000. I would not choose Sherman, Texas, for an international student. It is not cosmopolitan. (Austin College is not in Austin, Texas! not even _near_ Austin, Texas. Some people think it is.)
I have known Minnesota students who went to St. Bens/St. Johns and were happy. It has a pretty strong Roman Catholic feel; if you are Catholic you might appreciate that. Minnesota weather is very cold and snowy for much of the year. It might be hard for you to get used to if you come from somewhere that is usually warm.
Have you looked at the size of each school - they are all pretty small, maybe about the same size? - and the number of foreign students at each? and the number of out of state students at each? This might be important or helpful for you.
If it were up to me and I could not visit the schools, I think I would choose Trinity in San Antonio.