The statement above is FALSE.
Homonyms refers to two or more words which have the same spelling, the same sound but different meaning. The three words given above, that is, Mary, Marry and Merry do not have the same spelling and sound, therefore, they are not homonyms.
Theme is a binding agent. It makes everything in a story stick together.
To state its theme is one way of describing what a story is about. To start finding a story’s theme, see if there is a more or less generic concept that fits, like “reform”, “racism”, “good vs. evil”. The theme of Shakespeare’s Othello is jealousy.
Once this broadest sense of theme is established, you could get a little more specific
The correct definition of Wikipedia is it’s essentially a free online encyclopedia. I hope this helps!