I'm pretty sure the first one uses the dash correctly.
Susie has been invited to go on a trip to the Yukon Territory-her favorite place-and Eastern Alaska
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The answer would be B, because you place commas around unnecessary information, which would be the fact that she is a tour guide.
Answer:
This conclusion lacks to specify the adventures Merri had and the countries in which they were lived.
Explanation:
There is no evidence that Merri really is an adventurer so that the above text is really a conclusion, for this reason it is necessary to add specific experiences about the adventures that Merri lived, thus showing the place where these adventures took place.
In other words, we can say that the conclusion lacks specificity and shows no real adventures so that we can conclude that Merri is really an adventurer.