What is the definition of “theme”?
a. a lesson the reader infers from a text
b. a recurring object, concept, or idea
c. the central message or insight revealed in a text
d. when the opposite of what is expected occurs

The definition of “theme” is the following one:

c. the central message or insight revealed in a text.

Explanation:

Theme is that message that is conveyed throughout a text, or at least during most of it. It is also an insight which can be revealed, since themes can often be found between the lines.

Examples:

The book "A Clockwork Orange", by Anthony Burgess, which shows a gang whose acts of violence seem to be carried out merely out of pleasure. We can say its theme is the recklessness of youth and what the state does to try to contain it, even though it is not said by any of the characters explicitly.

The book "Hatter's Castle", by A.J. Cronin, in which an opressive father figure carries out a kind of dictatorship within the household and ends up in disgrace. We can say it is about the negative effects of such a behavior on others and on the individual itself, although it is not explicitly said on the book.

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