Fill in the blank with the most appropriate word.
"I'm going to university next year"
"What _____ study?"
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 D is correct as the given complete sentence indicates (am going to) indicates the use of present continuous tense.
The other options are wrong as no other tense other than present continuous tense can be used.
The correct answer is D)are you going to