A theme can be inferred if it is a recurring element in a story that is being narrated.
For example, if a text talks constantly about getting revenge, there is a very good chance that this is the theme or one of the themes of the text and this would help advance the plot.
<h3>What is a Theme?</h3>
This refers to the central message of a text that an author wants to convey to his readers.
Hence, we can see that your question is incomplete because you did not include the text, so a general overview was given to help you better understand the concept.
Read more about themes here:
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Explanation:
<h3><em>Eating a variety of foods is essential to life. In other words, we need to eat to live. Our bodies cannot manufacture all the substances we need and therefore we must consume foods to produce energy and to provide the building blocks necessary to sustain life.</em></h3>
Theme, tone, and purpose of the short story The Landlady by Roald Dahl.