Two weeks ago Mr$.$ Nelson outlined the steps for a research project the students were starting. Each student selected a topic to research from a list Mr$.$ Nelson provided. The students have been given $30$ minutes each class day to use their assigned laptops and work on their research. Today Mr$.$Nelson checked on the students' progress and realized very little had been accomplished. What should he have done differently from the start to increase the students' productivity?

A$.$ Send the class to the computer lab to do research on the computers with an expert technology person available.

B$.$ Provide interim deadlines and checkpoints for the students.

C$.$ Provided the grading rubric.

D$.$ Give them the entire class period to work each day until they are finished.