Answer:
D. Riku
Step-by-step explanation:
Riku is the student who is most clearly determining new research goals. In these lines, we learn that Riku and Victor are discussing what the concept of "dystopia" is. However, they seem to be struggling to reach a conclusion. Eventually, Riku states that they should each research the definition separately, and then compare notes. This means that it is Riku who is setting new research goals.