Which physical trait length has been found to correlate with marital success?

• A. Length of middle finger
• B. Ear lobe length
• C. Arm length
• D. Nose width

Answer: (A)

This question tests how a physical measurement might relate to a complex social outcome like marital success. In research, many single physical traits are explored for possible associations with life outcomes, but any real link tends to be weak, inconsistent, and influenced by many other factors. Among the options, the length of the middle finger has appeared in some exploratory studies as a possible, though weak, correlate with various life outcomes, whereas ear lobe length, arm length, and nose width do not have credible reported associations with marital success. Even when a correlation is observed, it does not imply causation, and such a trait would be a poor predictor of whether a marriage will endure. So the middle finger length is the best choice among the options, though the relationship—if it exists at all—is tentative.