The blue whale's heart is enormous ______ roughly the size of a small automobile and weighing nearly 400 pounds.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
;
- B
, being
- Ccheck_circle
—
- D
:
Explanation
An em-dash provides emphatic amplification of "enormous" with a noun phrase. A colon also works but the em-dash is preferred for dramatic emphasis; a semicolon requires an independent clause; ", being" is awkward.