Which would be the best transition to add to the beginning of the third sentence in paragraph four? a) however, b) therefore, c) for example, d) nonetheless,

iv. narcissism:
beyond just being distracting and dangerous, mp3 players are detrimental and damaging to society as a whole. mp3 players work against a community of listeners. everyone is walking all over the neighborhood, plugged into their latest favorite playlist, but no one is talking to anyone. people who are addicted to their mp3 players don’t care about other people. they don’t want community and contact with the real world. mp3 players also actively destroy live musicians' ability to make a living with their art form. no one wants live music anymore when they can pay less to hear it instantly and privately anytime they want. if we don’t curb our use of mp3 players, all our musicians will languish and no new music will be developed.