The correct answer to the question is:
B. Theme
Explanation:
1. A theme is an idea or meaning that runs through a piece of music, literature, visual art, or other forms of artistic expression.
2. It serves as the central message or insight into life or human nature that the artist wants to convey to the audience.
3. Themes can be expressed in various ways within the work, such as through characters, symbols, or plot events.
4. Identifying the theme of a piece of art helps the audience understand the underlying message and the artist's intention.
In this context, while elements like moral, mood, and tone play essential roles in artistic expression, the specific element that represents the overarching idea or meaning is the theme.