Marie Curie's discoveries ______ which earned her two Nobel Prizes in two different sciences ______ revolutionized the understanding of radioactivity.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
; / ;
- B
( / )
- C
, / ,
- Dcheck_circle
— / —
Explanation
A parenthetical clause may be set off by paired em dashes for emphasis. The two punctuation marks must match — both em dashes here.