Sentence 4.
The paragraph is about King's march on Washington. Sentence 4 adds extra information about what happened during his second march that is interesting but not necessary for the paragraph's purpose.
B. It has a lighthearted affect on the conclusion that suggests the conflict has been resolved
D is the word that means the opposite of novice
Use the second example. the excitement I had grew exponentially after that,as I wanted to know what would happen to me and my friends next