B.) "<span>The thieves represent all those who try to take a short cut on their journey and who, in doing so, fail to realize their Personal Legend."
</span>C.) "The thieves harm the boy, but they are also an important part of his journey; Santiago would not have found his treasure without them."
I just took the quiz as well and can confirm that these are the correct answers. Thanks!
In this sentence the object for among cannot be found
The animals that are being sampled are can die if the sample is not made with properly
"between the two countries"
A prepositional phrase needs to contain a preposition, in this case it would be "between". As well it needs to modify the sentence and it should mention the object of the sentence. So "between the two countries" is correct.