No Ancient Greek philosopher can have been that great a great thinker. After all, the best great thinkers teach at prestigious universities. And no Ancient Greek philosopher taught at a prestigious university.

Which of the following tacit premises does this argument rely upon?

There were prestigious universities in Ancient Greece.

Some Ancient Greek philosophers did teach at prestigious universities.

Everyone agrees about who the great thinkers are.

No Ancient Greek philosophers wanted to teach at prestigious universities.

Ancient Greek philosophers are often thought to be great thinkers.