I’d choose A as the best answer : It provides them more social interaction with others.
Professional Social networking sites are used by almost everyone to collaborate, network, share, and generate content and knowledge. These features are of great importance in the context of education. Professional networking sites allows you to connect and share other ideas with other professionals. They make is easier for students to share their teaching techniques and learn from others as well. Professors are able to connect to their students off campus and create accounts for students where information can easily be accessed.