Answer:
fewer
Explanation:
The others don't make any sense and you could do the process of elimination so you would eliminate lesser and few so then your left with the words less and fewer but in this case fewer makes the most sense.
Independent clause: "Frances has plenty of time"
Dependent clause: "to devote to her painting"
You need to decide the person's fate such as what force will be working against them. As well as how they defeat the force and come out a victor.