Both panel members agree that sentence 3—"One or two hankies are more than enough"—is the only grammatically correct option among the four choices.

The core principle governing this answer is subject-verb agreement in the context of the conjunction "or." When a subject consists of two elements joined by "or," standard English grammar requires the verb to agree with the element nearest to it [1][2][3]. In this case, "two hankies" is the plural subject positioned immediately before the verb, so the verb must be plural: "are" rather than "is."

Equally important is noun pluralization. The phrase "one or two" functions as a numerical range where the final number—two—determines the grammatical number of the noun that follows. Since two is plural, the noun must be pluralized to "hankies" rather than remaining singular as "hankie" [4][5][6][7]. This rule applies consistently: you would say "one or two apples," "one or two books," and similarly "one or two hankies."

Sentence 1 fails because it pairs the plural noun "hankies" with the singular verb "is." Sentence 2 incorrectly uses the singular noun "hankie" after the plural number two, combined with a singular verb. Sentence 4 uses the singular noun "hankie" despite the plural number two, even though the verb "are" is correctly plural—the noun form remains wrong.

One member noted that in informal or dialectal speech, some speakers may treat "one or two" as a fixed singular expression and say "one or two is," but this is not standard written English [8]. Standard grammar, as taught in composition handbooks and style guides, consistently requires the plural form shown in sentence 3 [9][10].