Imagine that you have an online class and that all but one person is having no trouble with finding the site, finding the materials, completing the work, and so forth.
Imagine, too, that you have multiple e-mail addresses but that you have instructed your class (via the syllabus, Blackboard, e-mail messages to them, announcements, and so forth) to use one specific e-mail address.
What are the odds that the same person who couldn't see that there are writing assignments in the class if they were written on the side of a barn door has managed to sleuth out your least-used, most-obscure e-mail address, the one you rarely check, and has sent you multiple messages complaining that he or she can't understand how to access the course materials?
a) Nah, couldn't happen.
c) A hundred percent.
You'll never guess this one in a million years.