Select a suitable verb option to complete the sentence:
Three days _____ long enough for a good holiday.
A verb is used to express an occurrence, action , or state. It is the grammatical centre of the predicate in a sentence.
An auxiliary verb is a verb which gives is used in the formation of tenses, moods, tones, etc.
Option C is correct as the subject is plural and the sentence states a fact.
The other options are wrong as the subject is not singular and the sentence is not in the past tense.