Which sentence has proper subject-verb agreement? 1.Hope, peace, and love is achievable for everyone.
2.Neither Harper nor Finn are aware of the details.
3.Missouri and Illinois are states along the Mississippi River.
4.Either you or I are responsible for cleaning the house this afternoon.

The sentence that has proper subject-verb agreement is C. Missouri and Illinois are states along the Mississippi River.

It should be noted they the subject and the verb must agree with one another. In this case, if the subject is singular, the verb will have to be singular too.

When the subject is plural, the verb will be plural too. Missouri and Illinois are states along the Mississippi River has a proper subject-verb agreement.

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3). Missouri and Illinois are states along the Mississippi River.

Explanation:

The sentence 'Missouri and Illinois are states along the Mississippi River' contains a proper subject-verb agreement because when the two nouns('Missouri and Illinois') are linked using the conjunction 'and', a plural verb is used(are) to offer a coherent meaning. This rule makes the first sentence go wrong as it involves more than three nouns(hope, love, and peace) using a singular verb 'is' instead of 'are.' The other two are incorrect as indefinite pronouns(either/or, neither/nor) carry the verb of the nearest noun or pronoun. Thus, option 3 is the correct answer.