B:by explaining the best ways to use social media
Social media has the power to educate minds, but it can also divert people's attention from important tasks.
it is important that students and educators strike a balance between traditional methods
The answer is "Or" because "Or" is a conjunction..
B is more like a note for class than the others. So I say go with B.
I think that the answer is C, but I am not 100% sure.
