Answer:
The correct answer is option D. "Roman numerals".
Explanation:
Informal outlines are characterized for being a series of wandering notes enumerated in dashes, which are usually reduced to short statements, single words or phrases. Informal outlines are helpful to gave an idea of what the formal article would cover. Roman numerals are not part of an informal outline, since roman numerals are included later in the writing process when the body of the article is almost finished.
