Answer:
A: Homework Grade (option 1)
B: Final Course Grade (option 2)
C: 0.724 (option 4)
Explanation:
It is most likely reasonable to assume that final course grade depends on homework grade; after all, you only get your final course grade after completing all your required homework. We then have that A is your homework grade, and B is your final course grade.
I am assuming that the grading scale is out of 100. It would then be very unreasonable (but good for your GPA ;)) if for every extra point that you receive on a homework assignment, your grade would increase by more than 20%. The answer for part C is then most likely 0.724, which is a much more reasonable increase in course grade per additional homework point.