Here Is a Table of the Undergraduate Enrollment at a Large

Multiple Choice

Here is a table of the undergraduate enrollment at a large state university, broken down by class:

The percentage of students in the five classifications should add to 100%. In fact, they add to only 99.9%. The reason is that

A) there must be an arithmetic mistake.
B) the percents are not exact, because they are rounded to one decimal place.
C) some students must be left out, so the total should be less than 100%.
D) this is an example of a biased measurement.