You can’t choose a college, though you can express a preference by entering a college campus code on your UCAS application. Campus codes are listed on each college page. Even if you do specify a college, other colleges may also interview you, and any of them may offer you a place. Or, you can make an open application by choosing campus code 9 on your UCAS application. Your application will be assigned to a college or hall that has relatively fewer applications for your course in the year you apply. Find out more here about choosing a college.
Candidates for BA Archaeology & Anthropology can apply to seven colleges at Oxford:
Harris Manchester (for over 21 year olds)
St Hugh's College
St John's College
St Peter's College