The box plots below show student grades on the most recent exam compared to overall grades in the class: Two box plots are shown. The top one is labeled Class. Minimum at 74, Q1 at 78, median at 85, Q3 at 93, maximum at 98. The bottom box plot is labeled Exam. Minimum at 81, Q1 at 85, median at 93, Q3 at 96, maximum at 99.

Which of the following best describes the information about the medians?

a. The exam median is only 1–2 points higher than the class median.
b. The exam median is much higher than the class median.
c. The additional scores in the second quartile for the exam data make the median higher.
d. The narrower range for the exam data causes the median to be higher.