help please

In a 2013 study, Jonason, Jones, and Lyons studied the differences in personality traits of 263 university students and compared those traits to whether the student was a "morning type" or "evening type".They found a those who were evening type to be more, on average, more narrassistic, psychotic, andmanipulative.What is the population of this study?

People who prefer to stay up late

All people

The 263 university students in the study

All university students