You receive a score of 91 out of 100 on an exam (good job!). You are told that the average score on the exam was 50, the standard deviation was 20, and the scores were normally distributed, so what else is true of your score?

a. Your score was among the top 50% but not among the top 33% of scores

b. Your score was among the top 5% of the scores but not the top 2.5%

c. Your score was among the top ~33% of scores but not among the top 5% of the scores

d. Your score was among the top 2.5% of the scores