Answer:
C
students from many countries participating in coursework offered by an online university
Step-by-step explanation:
Although both options B and D show the effect of the internet, they are associate to a specific place, then they are not related to the interconnectedness of global society. That is, even with electronic voting machines, you have to go to a specific place to vote, and even you can access to your local library's database from your home, it's only helpful if you then go there to collect the books.
In option C, both the effect of the internet (which allows you to take a course without going to the classroom) and the interconnectedness of global society (because anyone around the globe can take the course) are illustrated.