It's bandwagon because the phrase "hopping on the bandwagon" represents patriotic pride during the 1940's or so
They are sources that you can find the date, author, and have real facts and not just made up. Like if you went to the IRS website then that is a credible source for tax where as going to Wiki they are not credible because anybody can go there
I would say A,. Electronics in the classroom negatively effect (not effects) the learning environment. This will then be your reason for your entire paper, allowing you to back it up easily