All member nations of the North Atlantic Treaty Organization, or NATO—including Iceland, which joined in 1949; Hungary, which joined in 1999; and Bulgaria, which joined in _____ are committed to NATO’s principle of collective defense, each member pledging to defend all others.
Which choice completes the text so that it conforms to the conventions of Standard English?
A. 2004;
B. 2004,
C. 2004
D. 2004—
Since commas are used around nonessential elements, my view is that:
- The clause should be set off by commas, and
- Because there is already a comma before “or” (in the full sentence), the ending comma after the year should also be included — meaning the correct choice should be B: “2004,”.
Is D: “2004—” is acceptable, since the main clause resumes immediately after, and the previous punctuation used was dashes (for the earlier appositive offset: “—including Iceland…”)?