Scroll past the initial statistics to find the student submissions. They will be under the initial graphs in a section titled Submissions. By default, submissions are sorted by date.
If you would like to see an individual student’s attempts next to one another, click Name to sort by student name.
You can also see an individual student’s attempts for an assignment by clicking on the student’s name and then on Score History. Score History will show activity such as Score and letter grade, if/when the student saved answers before submitting, and if/when an instructor overrode an auto-graded score.