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Option a is correct..
- Headings point out key ideas of the text, and subheadings provide additional information about headings.
The statement that best describes the purpose of headings and subheadings is Headings point out key ideas and subheadings provide additional information.
Purpose of headings and subheadings:
The motive of headings and subheading should be that the heading point out the important ideas of the given text.
On the other hand, the subheading gives the additional or extra information related to the heading.
Therefore, the first option is correct.
Learn more about heading here: https://brainly.com/question/15738501