The first, from the physical description of the man. The second, when it says the people screaming, and I'm sure we could guess sounds from the pistol being pulled out. Possibly the third, because the boy is walking out of the store firing a pistol. And the fifth, because the readers become concerned for those at the scene.
After going through the poem, we can easily interpret what the poet wants to convey. However, we are given several options to choose from. The imagery utilized by the poet affects the readers in the following ways:
Opt 1- It definitely creates a visual of the skinny man.
Opt 2- It also conveys sounds to create a more engaging frame for the reader.
Opt 3- These imagery elaborates the actions done by the boy.
Opt 5- Following this, the imagery boosts the readers to care for the character.