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Answer:
Don't.
Explanation:
Contractions are those words that are shortened by omitting a letter/letters from the word. They are commonly used in an informal writing or speeches whereas formal writings tend to not use them.
Among the given options, the plural contraction is "don't".
Isn't is used only for third person singular such as "he, she, it".
Hasn't is also used for third person singular.
Wasn't is used for first person singular and third person singular.
Don't is used for first person, second person and third person plural.