"But I choose the road less followed" maybe? It shows that unlike others, he took the less used path. He divides himself from others.
They create and add suspense throughout the story, making the rising action mysterious and different so that once you hit the climax, what you thought was going to happen is completely different than what did
The answer is ABABCDCD as the two lines that rhyme are equal to the same letter. E.g. Line 1 and Line 3 both end with a word that rhyme with each other and the Line 1 is the first line of the poem, resulting it in being represented by A. The same thing applies to the rest of the poem
I hope that makes some sense :)