Utilize the input text as a context reference, choose the right relationship between 'Syriza' and 'Athens' from the options.
Options: distribution format, position held, creator, headquarters location

Nobel prize winning economist Paul Krugman, a vocal supporter of Athens in its long-running bailout saga, said Sunday that he "may have overestimated the competence of the Greek government," suggesting Syriza staged the showdown without having a Plan B.
headquarters location