Fill in the blank with a suitable option:
You __________ do it now. You can do it this afternoon.
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 is used in the formation of tenses, moods, tones, etc.
Option C is correct as this afternoon indicates the use of needn't (negligible necessity).
The other options are wrong as no other tense can be used here.
The correct answer is C) needn't