When you are speaking about a topic, you should show NOT just knowledge but enthusiasm, as stated in option B of the answer choices and explained below.
Knowledge vs Enthusiasm
The very first and most important thing you must show when speaking about a topic is knowledge. Your listener or audience will certainly judge you based on the amount of information you know about that topic, that is, how deep your knowledge is.
However, that is not the only thing you must show. Enthusiasm is also important, especially if your purpose is to persuade the audience to do something. When they sense your enthusiasm, they will be more likely to pay attention and join your cause.
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