Which sentence contains correct parallel structure?

at the pre-school, they teach children to speak polite, walk slow, and act fairly.

at the pre-school, they teach children to speak with politeness, walk slowly, and act fair.

at the pre-school, they teach children to speak politely, walk slowly, and act fairly.

at the pre-school, they teach children to speak polite, walk slowly, and act

At the pre-school, they teach children to speak politely, walk slowly, and act fairly.

Explanation:

Parallelism is when phrases in a sentence have identical grammatical structure.

Three verbs speak, walk, and act are respectively modified by the adverbs politely, slowly, and fairly.  This is correct parallel structure.  

The other sentences use adverbs, adjectives, and even a prepositional phrase to modify verbs. Since the grammatical form of these modifiers is different, the sentences do not contain parallel structure.

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."

the purpose of a nonfiction text is to give the text a rap up. for example, when i say : frogs are interesting animals is an ending. then when i say: frogs are unique in different ways. that is an intro.