Which of the following is a correlational hypothesis?

a. Education on the process of preparing meat for consumption leads to a decrease in the consumption of hamburgers.

b. A decrease in the value of the U.S. dollar relative to other currencies leads to an increase in exports

c. Low interest rates resulted in a record year for real estate investment trusts (REITs) as individuals invested in real estate rather than other forms of investment

d. People in the South tend to rate the President more favorably than do people in the North

e. An ncrease in. family income leads to an icrease in the percentage of income spent on housing