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The correct answer is Susie has been invited to go on a trip to the Yukon territory—her favorite place—and Eastern Alaska.
In this sentence the Em dash is used to mark a part of a sentence that does not interfere with its general idea. The other two types of dashes, hyphens or N dashes, are used for compund words e.g. all-inclusive; and ranges e.g. 100--200 characters
Susie has been invited to go on a trip to the Yukon Territory—her favourite place—and Eastern Alaska is the sentence below shows correct use of an em dash. Hence, option A is correct.
What is trip?
A voyage during which one can travel there for a brief period of time before returning. Trip can be for the short time as well as long time vacation to some other place rather than home.
The trip is not means to be permanently shifting or moving from home to some other place.
Thus, option A is correct.
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