The mathematician dedicated her career to solving one famous problem ______ the so-called Riemann hypothesis, which has stumped researchers for over 150 years.
Which choice completes the text so that it conforms to the conventions of Standard English?
- Acheck_circle
:
- B
, that
- C
, being
- D
;
Explanation
A colon introduces a noun-phrase elaboration of "one famous problem." A semicolon requires an independent clause; ", being" is awkward; ", that" creates a fragment.