[Solved] Which of the following is a threat to the internal validity of studies using one-group pretest-posttest design? A)Cohort effects B)Statistical regression C)Propensity score matching D)Selection bias Bisexual Attractions: Bisexual Attractions describe a person's romantic or sexual attraction to more than one gender, not exclusively to people of a different sex or the same sex. Erotic Plasticity: The degree to which an individual's sex drive and sexual preferences are shaped by cultural, social, and situational factors. Heterosexual Couples: Romantic partnerships between individuals of opposite sex, typically involving sexual and emotional relationships. Erotic Pictures: Images intended to provoke sexual arousal.