Bryce collected data about the amount of time each student in his history class spends studying. If the range of these data is 1, what does this reveal about the data?

All the students in his history class spend exactly 1 hour studying.
All the students in his history class spend an average of 1 hour studying.
The smallest and largest data values are 1 unit away from each other.
The middle data value for time spent studying by all students in his class is 1 hour.

Question

Bryce collected data about the amount of time each student in his history class spends studying. If the range of these data is 1, what does this reveal about the data?

 All the students in his history class spend exactly 1 hour studying.
 All the students in his history class spend an average of 1 hour studying.
 The smallest and largest data values are 1 unit away from each other.
 The middle data value for time spent studying by all students in his class is 1 hour.