Option 'b' is correct.
Step-by-step explanation:
Since we have given that
Average marks in Homework = 95
Average marks in Quiz = 90
Average marks in Test = 87
According to question, we have that the teacher weights homework at 20%, Quizzes at 20%, Test at 40%, and the final exam at 20%
Total score in the class = 90
So, Score of homework is given by
Score of Quiz is given by
Score of test is given by
So, it becomes,
So, minimum grade Anna can make on the final is given by
Hence, Option 'b' is correct.