Quiz improvements

Thanks for all your feedback today. Here are some altered questions that less ambiguously express the challenge I intended.

In part one, if the passage had read:
There has been a rash of termite infestations in the neighborhood. Nobody wants their house to be eaten by termites, so all residents with wooden homes should have their houses inspected by a qualified exterminator.
It might have been more clearly an argument (albeit with an advisory as its conclusion).

Likewise some of you thought the Epictetus example was not an argument, because strictly speaking the author of the passage simply reports Epictetus's argument. The instructions did ask whether the passage CONTAINED an argument, which it does, but that's not a nuance I was intending to test you on. Better: “Death is nothing to us, for that which is dissolved is without sensation, and that which lacks sensation is nothing to us.” – Epictetus. Supply the evident, if controversial, premise that death is dissolution, and explain that the second premise means that we ourselves, when dead, lack sensation, and the argument is pretty good.

For the first Denver example, perhaps if I had quoted a tourist brochure: “We like to call Denver the “mile-high city” because it’s the largest American city at that elevation.” -- tourist brochure it would be clearer that "because" here is more of an explanation than a premise indicator.

Lastly, here's a variant on the Trade Center example that eliminates any temptation to think perhaps there was an attack that left the buildings standing: The attack that destroyed the World Trade Center in New York City occurred in the morning either on September 10th, 2001, or on September 12th of the same year. The towers were still standing at the end of the day on the 10th, so the attack had to have occurred on September 12th.