Which sentence is punctuated correctly?
in 1998, the (national kickball association) was started in louisville, kentucky by two co-workers and friends.
the national kickball association (nka) is a group that sets up kickball leagues for adults across the united states.
the founders of the national kickball (association) nka encourage people to start leagues in their towns.
larger cities in the united states, like san francisco and dallas, have multiple national kickball association (nka leagues).

The National Kickball Association (NKA) is a group that sets up kickball leagues for adults across the United States.

Explanation:

Parentheses can be used to enclose an abbreviation for a term following the written-out term, when used for the first time in a text. The parentheses should follow the written-out term in order to explain how the term is abbreviated. You should not use BOTH parentheses and commas to set apart an explanation or abbreviation. (Study Island)

postive, comparative, superlative - good, better, best

recall how we defined nouns as words capable of having plurals and possessive endings. adjectives (and their first cousin, the adverb) also have a feature that distinguishes them. they come in three states. first, the raw adjective—in its positive state—merely describes the noun modified; it doesn’t care about how this particular person or thing stacks up against other members of the same noun class

a phrase is a set of word that make a sense, an expression formed by two or more words.

" teacher´s dictum on the possession of human "

" made a pile practicing "

" lived to an impressive age and dies "

a clause, in a grammar way is a series of words that have a complete meaning.

" was irritated by the persecution of those who called themselves "