She thanked her parents, the historian ______ and the librarian for helping her research the manuscript.
Which choice completes the text so that it conforms to the conventions of Standard English?
- A
;
- B
:
- C
(empty)
- Dcheck_circle
,
Explanation
Without the Oxford comma after "historian," the sentence could be misread as identifying her parents as the historian and the librarian. The serial comma resolves this ambiguity.