Answer: It develops the idea that the speaker feels like an outsider with the other boys.
Step-by-step explanation:
Option 4 is correct. The excerpt is important to the poem as a whole because it develops the idea that the speaker feels like an outsider with the other boys. He is "banished to the outfield" and is daydreaming, rather than paying attention to the game. This leads to him being hit by a ball, further emphasizing his feeling of being excluded and different from the other boys.