The mean grade in Mr. Smith’s math classes is 86.5, and the mean grade in Mrs.
Shell’s math classes is 90.2. Based on this information, it can be inferred that the
students in Mrs. Shell’s math class __________.

A. like math more than students in Mr. Smith’s math class
B. study more for tests than students in Mr. Smith’s math class
C. have fewer absences than students in Mr. Smith’s math class
D. earn better grades on tests on average than students in Mr. Smith’s math
class