Some scientists are curious. All curious people are open-minded. Which conclusion necessarily follows?
Correct: B
From 'Some S are C' and 'All C are O', we can conclude 'Some S are O' by the chain rule. Since some scientists are curious and all curious people are open-minded, those scientists are also open-minded. This is a valid conclusion. The other options either reverse the universal premise or make unsupported negative claims.