“I have night's cloak to hide me from their eyes” “Thou know'st the mask of night is on my face”
“O blessed, blessed night! I am afeard,
Being in night, all this is but a dream”
'Tis almost morning. I would have thee gone.”
“Good night, good night! Parting is such sweet sorrow”

what is similar about the quotations

If taken similar literally, the quotations all mentioned the word night.

because of all the immigration, america became one big melting pot. the diversity of cultures from all over the world made america somewhat divided as well. people that immigrated stayed with their kind, and their traditions, while native born americans stayed with their kind and their traditions. normally, people born in american scorned the immigrants as well. the new religions also divided america. in summary, it took away from the american culture and identified america as the "melting pot."

i think it may be b, i'm not exactly too sure on this. but b seems to make more sense.