Which of the following sentences follows the rules of subject-verb agreement?

The early songs of B.B. King is also one of her interests.
Van Gogh's Still Life: Vase with Twelve Sunflowers are our next discussion on the work of Van Gogh.
One result of our discussion was that Austen's novels help students appreciate British literature.

One result of our discussion was that Austen's novels help students appreciate British literature.