Final answer:
The Implicit Association Test (IAT) is used in research to measure unconscious racial prejudice.
Step-by-step explanation:
The correct answer is A) Implicit Association Test (IAT). The Implicit Association Test (IAT) is a research tool used to measure unconscious racial prejudice. It assesses the spontaneous associations individuals make between various social categories (e.g., race) and concepts (e.g., good or bad) by using reaction times.