The proper agreement between subject and verb can be seen in the sentence: The girls want to go to the store to get cookies for their holiday party.
We can arrive at this answer because:
Agreement between verb and subject occurs when the verb is correctly conjugated with the subject of the sentence.
The verb is the word that indicates an action that takes place in the present, past, or future, and the subject is the word that presents the person or thing that is promoting or suffering the action of the verb.
In this case, we can see the verb "to want" and "to go" in the sentences above and the subject is "The girls."
"The girls" is associated with the pronoun "they" which requires the verb to be conjugated as "want" and "go."
Therefore, we can recognize that the correct answer is the sentence:
The girls want to go to the store to get cookies for their holiday party.
You can have more information about the concordance between verb and subject at the link:
