Which of the following words is closest in meaning to conclusion?
You’re in the right neighborhood - both a conclusion and a premise are components of an argument. A premise is the basis for the conclusion.
Well done!
Both words begin with con-, but that’s the only similarity between them. A conference is a gathering of people with a common interest (professional or other).
Both words end with –sion, but that only shows us that they’re both nouns. Inclusion comes from the more familiar word include.