Answer:
C. I., A., 1., a.
Step-by-step explanation:
Outlining a text may be required in a writing process. And this tool helps to present a thought in a well organized manner. The labeling of an outline has a standard format that must be followed in order to avoid muddling up of ideas.
In the given question, the appropriate option showing the correct sequence of labels for a standard outline is C. I., A., 1., a.