Use your homework as a starting point to compare different film posters.
The first poster merely shows the american flag and i miss the main characters of the story.
The second poster indeed shows the main characters, but they just drink a cup of tea together. That demonstrate that they create a plan together or seal a plan.
In my opinion the third poster fits best of all to the film.
On the third poster you can imagine the attitude of the main characters. You can see that Motss is creative and energetic and that Brean is knowledgeable and composed. Therefore it’s the best of all.