Answer:
Add a comma after "happens"
Explanation:
Adding a comma after "happens" fixes the run-on sentence.
They relied on cleverness. You know that because they came up with the plan to leave a large wooden horse and they pretended to sail away. This made the Trojans think the Greeks were surrendering so they celebrated. But as we know the horse was filled with Greek soldiers prepared to attack.
Hope this helps!
Because we get in our self quick when we know who we are
B: Joke, because this word is not grade-appropriate