Answer:
D what is the purpose is the answer
The correct option is: "Sydney draws visitors from all around the world to see its iconic architectural masterpiece—the Sydney Opera House."
<u><em>The dash </em></u>can be used in English to add explanatory phrases or comments, similar to parentheses. In formal writing, parentheses should be used instead of hyphens, since the latter sign is considered more informal. Dashes can be used to emphasize a sentence.
The author foreshadows rainsford's experience on the island by rainsford hearing gunshots