:2. The scores on a final exam follow the normal curve with an average of 60 and an SD of 20. The instructor wishes to count the top 20% of the scores as A's, with the rest of the scores as B or lower. Which of the following final scores is the most suitable cutoff between the A's and the B's?

a. 55

b. 75

c. 65

d. 95

e. 85