The part of an outline from the following is the roman letters and numbers for supporting ideas.
Option C is the correct answer.
What is meant by an outline?
An outline is referring to the ideal description of the characteristics of something and not in detail.
Roman letters and numbers are applied to the formal outline. There are two types of formal outlines where one is the topic outline and the other is the sentence outline.
Therefore, the roman numerals for supporting ideas represented the part of an outline.