B. is the BEST because it gives the flexibility of theme ideas for courage.
C. is very specific on climbing mountains as the only way to learn about courage.
A and D are criticising courage.
The literary device used in this sentence is analogy
Answer:
<em>Main points should be limited in speeches because too many will make your speech hard to follow and confuse your audience.</em>
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<em>Hope this helps love!</em>
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What is the context to this question ?