Why Do Correlation Coefficients Greater Than 0

Multiple Choice

Why do correlation coefficients greater than 0.50 rarely occur in the social sciences?

A) Human behavior is the product of many interacting variables; any single variable will be limited in its association with a behavior.
B) Social scientists fail to construct experiments carefully enough to detect larger correlations.
C) The highest value a correlation coefficient can take on is 0.60.
D) Social scientists have not yet discovered the variables that are the best predictors of human behavior.