In advanced English syntax and syntactic agreement, the governing verb must align correctly with its subject despite intervening modifiers, coordinate structures, or fractional quantifiers. Consider the following four advanced propositions regarding subject-verb agreement (syntax):I. When a singular noun phrase is modified by a post-modifying prepositional phrase containing a plural noun complement (e.g., *'The box of chocolates was missing'*), the matrix verb must be plural (*'were'*) because the structurally closest noun governs the agreement head under the proximity rule.II. When multiple subjects are connected by correlative disjunctions such as *'either... or'* or *'neither... nor'*, the agreement of the verb is determined by the principle of proximity, meaning the verb agrees in person and number with the subject noun phrase that is structurally closest to it.III. Plural-marked collective measurements, distances, sums of money, and periods of time functioning as a single conceptual amount or unit (e.g., *'Ten years is a long time to wait'* or *'Fifty dollars is too much for this book'*) regularly take a singular verb despite their plural morphological inflections.IV. When a relative pronoun (*'who'*, *'which'*, or *'that'*) acts as the subject of a relative clause, the verb within that relative clause must agree in person and number with the antecedent of the relative pronoun rather than the pronoun itself.Identify the option that correctly evaluates the grammatical, syntactic, and semantic validity of propositions I, II, III, and IV according to standard English syntax and Agreement (linguistics) theory.