Which option is the best example of a theme in a speech

A literary work such as music that creates a mood is an example of theme in a speech.

Explanation:

The theme statement is considered as that statement that deals with a piece of art that can be music as well as  literature . The theme is referred to as the main subject, the theme should be such that the reader is not confused while reading it. From a theme a reader can understand how a writer has critically analysed the work. A literary work should be done in such a way that it creates a mood for the reader.