A colon, when placed between two numbers indicates a ratio.
For example, 1:1 is saying that something is at a 1-to-1 ratio.
This would be better in the Math section though, but I'm happy to answer.
I think its C.locate key Info Because if you reread the paragraph you will find some sentences that will help you.
Answer:
C) Look for a point whose reasoning is flawed
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A complete sentence must include a subject and a predicate.