Which individual has never served as President of the European Parliament?

Barroso has never served as President of the European Parliament, which makes this choice correct. His involvement in European politics has primarily been as President of the European Commission, a position he held from 2004 to 2014. In contrast, the other individuals listed have all held the role of President of the European Parliament at different times. Pat Cox served as President from 2002 to 2004, Martin Schulz from 2012 to 2017, and Jerzy Buzek from 2009 to 2012. This distinction is crucial for understanding their respective contributions to European governance and the specific roles they have played in EU institutions.