How can an antonym in a context clue help a reader discover the meaning of a word?

It provides a contrast to the unknown word.
It provides a contrast to the unknown word.

It restates the meaning of the unknown word.
It restates the meaning of the unknown word.

It replaces the unknown word with a familiar one.
It replaces the unknown word with a familiar one.

It gives the definition of the unknown word.

It provides a contrast to the unknown word.