Mount Everest's summit reaches a staggering altitude ______ 29,032 feet above sea level.
Which choice completes the text so that it conforms to the conventions of Standard English?
- Acheck_circle
—
- B
, being
- C
; that is
- D
, and
Explanation
An em-dash properly introduces an emphatic amplification (the specific altitude). "; that is" needs a comma after; ", and" requires an independent clause; ", being" creates an awkward participial phrase.