What type of word relationship does this analogy show?
Cave; cavern: song :tune

The given analogy can be referred to the sub-heading-main heading analogy. In the given example, cave is a smaller section of a cavern and a song is a smaller part of a tune. Therefore, one is the bigger part and the other is the smaller part.

Explanation:

answer; /// i do believe the correct answer is (c) public education;