With this outline, the wrong thing is that subtopics should be labelled A and B. Hence, Option C is correct.
What are subtopics?
A topic that is included within another topic is known as a "subtopic." According to the Britannica Dictionary, when there are parts or devices of any topic written on a piece of paper, those topics are known as subtopics.
In other words, any topic that is part of a broader or more general topic or a topic that has branched off into subtopics, For instance, within the Asia area, you may find separate discussion threads about Vietnam, Thailand, Malaysia, and Bali. —John Eckhouse.
An image is attached at the end for better understanding.
Therefore, Option C is correct.
Learn more about subtopics from here:
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