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 singular and the present simple tense is used for a present state, habits,routines, jobs, hobbies or expressing possession, generalizations, scientific statements.
The other options are wrong as the subject is not plural and do cannot be used. Does and goes can't be used together.
The correct answer is C)does/go