Final answer:
The most widely used personality inventory in the United States is the Minnesota Multiphasic Personality Inventory (MMPI), a self-report inventory consisting of true/false questions aimed at creating a clinical profile.
Step-by-step explanation:
The most widely used personality inventory in the United States is B) Minnesota Multiphasic Personality Inventory (MMPI). This inventory was first published in 1943 and is a self-report inventory composed of a series of true/false questions designed to establish a clinical profile of an individual. The original MMPI had 504 questions, which was then updated in 1989 to the MMPI-2 with 567 questions. The test aims to measure various psychological conditions and is often used in different settings including clinical diagnoses, occupational screening, and counseling.
Another widely known personality assessment is the Myers-Briggs Type Indicator (MBTI), which categorizes personality types into 16 different possibilities. However, it has faced criticism for its binary nature and oversimplification of complex personality traits.
The MMPI, which employs a series of true/false questions, is not a projective test like the Rorschach Inkblot Test but rather a self-report inventory. It remains the most established and prevalent personality assessment tool in the U.S., despite the availability of newer versions like the MMPI-2-RF.