Everytime we invite julie out, it rains. lets not invite her next time.

Well, if you are asking for the meaning of this sentence, then it would mean that Julie is not fun to have around. For instance it says, “ Everytime we invite Julie out it RAINS.” This shows that Julie may not be a fun person to invite or she might be the root of the drama. Another clue would be “ Let’s not invite her next time.” This shows that Julie is not being invited because everytime she goes it rains, or in other words everytime she gets invited it gets into trouble and people fighting with each other. So, this would be a “Post Hoc”
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Hey there! :)

A theme is...?

Let's go through each answer choice.

1st)  Something a character says in a story.

This would be incorrect because dialogue is what a character says in the story, this is not what the theme is.

2nd)  The main message found within the story.

This would be correct because themes are usually teaching you a lesson, and is the central idea of the whole story.

3rd)  An action someone has taken in the story.

This would be incorrect because a theme is not an action, themes usually do not have any action in it whatsoever, because once again, it is the whole idea of the story. 

4th)  An idea someone has in their story 

This would be incorrect because although a theme is an idea, it is not a specific someone's idea. It is the narrator's idea, or the author's idea.

So, the second option is correct.

~Hope I helped!~