Answer :
The correct form of the verb in the sentence is 'remains'. This is due to the subject-verb agreement which requires a singular subject to take a singular verb form.
The correct form of the verb in the sentence given is 'remains'. This is due to the subject-verb agreement in English grammar. In this sentence, the subject 'Optimism' is singular, so the verb must also be singular, thus 'remains' is the correct form. The subject and the verb in a sentence must always agree in number. In other words, a singular subject requires a singular verb form, whereas a plural subject requires a plural verb form.
Subject-verb agreement
is a fundamental principle in English grammar.
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