Answer:
La respuesta correcta es volverás
Explanation:
Volverán se usa cuando es ellos, ellas, ustedes y volverá se usa cuando es él, ella, usted
volverás
it is volverás because it is future tense. Also because it is one person, not more than one.
*English* If a science fiction writer and a scientist had a debate: What would the topic be? What would be the main argument of the writer? What would be the thesis and the main argument of the scientist?