Question

which sentence uses dashes correctly?
uluru is also known as ayers rock—it is a large sandstone formation in central australia.
australia is home to some unusual animals such as kangaroos—wallabies—koalas—kookaburras.
ballaratone is of the centers of the 19th - century australian gold rush and gold is still being mined—today
sydney draws visitors from all around the world to see its iconic architectural masterpiece—the sydney opera house.

Explanation:

Dashes are correctly used to set off a clarifying, defining phrase that elaborates on the preceding noun.

1. The first option uses a dash incorrectly; it should use a period or semicolon to connect two independent clauses instead.
2. The second option misuses dashes for a list; commas should separate listed items here.
3. The third option uses a dash unnecessarily to tack on "today," which disrupts the sentence flow incorrectly.
4. The fourth option properly uses a dash to introduce a specific example that defines the "iconic architectural masterpiece" mentioned earlier.

Answer:

D. Sydney draws visitors from all around the world to see its iconic architectural masterpiece—the Sydney Opera House.