An assignment notebook is important because that is where students organize all completed work for school. keep all their class and teacher lists. track all the grades they have received. record all their assignments and due dates.

The answer is D. "Record all their assignments and due dates".

Explanation:

The assignment notebook is a notebook where students complete their assignments given to them by their teachers. They also write due dates for each assignment so they know when each assignment is due and how to manage their time for each assignment.