Choice iv.) and v.) are the same. I chose iv.) and it was wrong
@divinedolphin Oh no! I'm so sorry! There was an error and the person who made the video was supposed to put the choice iv.) as positive "7/2". In the meantime, until we can fix this error, I've made both choices iv.) and v.) to be correct in the system.
Thanks so much for letting us know; we will get this fixed asap!