The Fact That High School Juniors Who Re-Take the Scholastic

The fact that high school juniors who re-take the Scholastic Aptitude Test (SAT) in their senior year typically achieve scores the second time that are about 50 points higher than the first time they took this test as juniors is an example of which type of extraneous variable?

A) Selection bias
B) Testing effects
C) Mortality
D) Instrument variation
E) History