Final answer:
The Bem Sex-Role Inventory is the most popular inventory used for gender-role research, designed to measure traditional masculine and feminine roles.
Step-by-step explanation:
Among the inventories listed for gender-role research, the Bem Sex-Role Inventory (BSRI) is an especially popular tool. This self-report inventory was developed by psychologist Sandra Bem in the 1970s. It assesses how well individuals ascribe to traditional masculine and feminine roles, offering insights into gender roles, gender identity, and the flexibility of gender traits. In contrast, the Minnesota Multiphasic Personality Inventory (MMPI) is mainly used for psychological diagnosis and occupational screening, and while the Big Five Inventory (assessing the five personality factors of openness, conscientiousness, extroversion, agreeableness, and neuroticism) is popular for assessing personality, it is not specifically designed for gender-role research.