Failure allows you to learn that making mistakes is contrary for you to learn how to avoid making mistakes like that again. You can't avoid something if you don't even know where it's coming from, so you need to make the mistake of not avoiding it to know how to avoid it next time.
The Moon's Shadow is disappointed because the town has a rundown appearance and vomit smell.
I think the best answer would be A
evidence and proof is important to support your credabilty