Patrick Conducted a Long-Term Study Involving Undergraduate Students from Diverse

Multiple Choice

Patrick conducted a long-term study involving undergraduate students from diverse backgrounds at a university. During the course of the study, there was an attack on a student who was identified as a member of the LGB (lesbian, gay, and bisexual) community. This led to other LGB students withdrawing from the study due to perturbation. Which of the following threats does this scenario exemplify?

A) Maturation
B) Selection
C) Testing effects
D) Attrition