While researching a topic, a student has taken the following notes:

* Architect Julian Abele studied Gregorian and neo-Gothic architecture in Europe.
* Abele worked for an architecture firm that was hired in 1924 to design buildings for Duke University's new campus.
* Most of the buildings on Duke's campus were designed in the Gregorian or neo-Gothic architectural styles.
* At the time, Abele was not formally credited with designing the buildings.
* Based on the buildings' architectural styles, historians believe Abele designed most of the campus buildings.

The student wants to specify why historians believe Abele designed most of Duke's campus buildings. Which choice most effectively uses relevant information from the notes to accomplish this goal?