Which of the Following Best Describes an Intervening Relationship Between

Multiple Choice

Which of the following best describes an intervening relationship between the variables "literacy," "economic productivity," and "wealth" for a sample of countries?

A) Literacy increases wealth, no matter the value of economic productivity.
B) Literacy increases economic productivity, which increases wealth.
C) Wealth is caused by neither literacy nor economic productivity.
D) Economic productivity increases wealth only when there are high levels of literacy.