The platypus ______ one of only five mammal species that lay eggs ______ is native to eastern Australia.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
—, —,
- Bcheck_circle
—, —
- C
—, —
- D
, which is, ,
Explanation
A pair of em-dashes correctly sets off the nonessential parenthetical. The other punctuation choices are malformed or create fragments.