Answer:
The characters and the plot plays a vital role in developing theme in a story.
Explanation:
In literature, a character is any person or inanimate object or animal. A story is made up of several characters such as protagonist, antagonist, dynamic character and so on. The characters of a story play a vital role in development of theme. Each character contributes to the development of theme in unique way.
For instance, in the short story The Ugly Duckling, the character of swans contributed in the theme when the ugly duckling came out to be a beautiful swan. The theme of appearance was developed by these characaters.
The plot is a series of event that takes place in a story. A plot helps to build the storyline. As the plot begins to unfold, it contributes to the theme of the story.
For instance, in the novel Pride and Prejudice, the theme of love was developed as the plot begins to unfold and characters begin to love and marry.