Syllogism: All humans are mortal. Socrates is a human. Therefore Socrates is mortal.

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This tests a straightforward universal-claim syllogism: if every member of a group has a certain property, and a particular individual belongs to that group, then that individual also has the property. Here, every human is mortal, and Socrates is a human. From those two premises, it follows that Socrates is mortal. The conclusion is a direct, necessary consequence of the premises.

The other options don’t fit because they either contradict the universal claim, restate a premise without deriving a new conclusion about Socrates, or add information not supported by the premises. Socrates is not mortal would clash with “All humans are mortal.” Saying “All humans are mortal” is just repeating a given rule, not concluding something about Socrates specifically. Saying “Socrates is a philosopher” introduces a claim not supported by the given premises.