While teaching a course online the instructor tells all learners to work through the material as a group. During the second day of the class the instructor recognizes that a learner is moving into the next online course unit early and then doing them incorrectly. Which of the following should the instructor do to control the pace of the learner? 

Answer options:

A. Send a private message to the learner addressing this issue.
B. Inform the entire class that extra information will be given during each unit that they will need for their assessments.
C. Assign outside research to the learner as independent study.
D. Inform the learners that if they continue to work ahead they will be removed from the course.

A