Antarctic ice cores contain a remarkable record of climate history ______ trapped air bubbles preserving the composition of Earth's atmosphere from hundreds of thousands of years ago.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
, which is
- Bcheck_circle
—
- C
;
- D
, and
Explanation
An em-dash dramatically introduces an amplification (a noun phrase). A semicolon needs an independent clause; ", and" needs an independent clause; ", which is" works grammatically but is wordier and changes the rhetorical effect.