Your first option, "I have taken all the stress I can stand.", is a line of dialogue.
Dialogue is speaking/talking. The second and last options cannot be examples of dialogue because they are not being spoken (you can tell by the lack of quotation marks).The third option is also incorrect because it is what is written, as it says "the study reported" (the study does not speak). Therefore, the first option is correct.
Explanation:
I would go for swimming cause it's good for health and it's fun too
A good example of a fable is "The Tortoise and the Hare" by Aesop.
Because the animals talk in the story, they are personified, and there is a moral in it.