Knowing what a motif is in fiction, what must a "leitmotif" be in music?

1. A long pause

2. A quiet interlude

3. A repeated tune

4. A song's ending

3. A repeated tune

Explanation:

Leitmotif is a word that has its origin from a German term which means leading motif. It is used by musicians to refer to "a repeated tune".

Leitmotif can be defined as a musical fragment which is used to represent an idea, a concept, a person that reoccurs in a piece of music. It is usually used by musicians who wants to tell a story through their music.