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
Theme is the central idea or meaning of a story. Theme in fiction is rarely presented at all; it is abstracted from the details of character and action that compose the story. It provides a unifying point around which the plot, characters, setting, point of view, symbols, and other elements of a story are organized.