What does the term 'number' signify in relation to nouns or verbs?

The term 'number' in grammar specifically refers to the grammatical category that indicates the quantity of a noun or verb. In the context of nouns, 'number' signifies whether the noun is singular (referring to one) or plural (referring to more than one). For example, the noun 'cat' is singular, while 'cats' is plural. This distinction is crucial as it affects verb conjugation in sentences, where verbs must agree with the subject's number.

In the context of verbs, 'number' also relates to the agreement between the subject and verb. For instance, in the sentence "He runs," 'he' is singular, and thus the verb 'runs' is too. Conversely, in "They run," the subject is plural, and the verb changes accordingly.

Understanding number helps ensure grammatical agreements and clarity within sentences, making option C the best choice since it directly addresses how 'number' pertains to the distinction between singular and plural forms.