You're studying the effect of stereotype threat on test performance. You randomly assign your participants to either a control condition (in which they are given the test with simple instructions on how to complete it) and an experimental condition (in which you first inform participants that women tend to perform worse than men on these kinds of tests). Later, you learn that your control condition included only one math major but your experimental condition included nine math majors. This difference in participant characteristics is a threat to ___________.

Question

a.
reliability

b.
external validity

c.
internal validity

d.
accuracy

my answer is D am i correct