What are all the characters of effective public speakers?
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Understands the needs of his audience.
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Attempts to meet those needs as effectively as possible.
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Is the expert and enthusiastic on his subject and has breadth of knowledge in other areas.
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All of the above.
Effective public speakers demonstrate all three qualities: understanding audience needs (A), striving to meet those needs (B), and having expertise with enthusiasm (C). Option D 'All of the above' is correct because successful public speaking combines audience awareness, responsive communication, and subject mastery. No single quality is sufficient alone.
"All of the above" is correct. Effective public speakers combine several traits: understanding their audience's needs, actively working to meet those needs during delivery, and having genuine subject-matter expertise/enthusiasm plus broader knowledge to field questions and make connections. Each listed trait is a real, complementary characteristic — none of them is sufficient alone, which is why the combined option is the right answer.