Which student is most clearly determining new research goals?

D. Riku

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.

this labor, by slow prudence to make mild.   c. ability to govern well

the answer is a because the astrophel does more and sidney goes to the astrophel more than stella.