Answer:
C. The word choice
Step-by-step explanation:
The title can tell you info about the main idea.
Supporting details tell you what you need to know.
The first paragraph tells you a good chunk of info as well.
*Instead of saying "Elephants and dogs play.", you can say "Elephants, as well as dogs play".
In that case, 'as well as' along with using 'and' mean the same thing despite the different choice of wording.
I hope this helps!