The value of a correlation is reported by a researcher to be r = 0.5. Which of the following statements is correct?

A. The x-variable explains 25% of the variability in the y-variable.

B. The x-variable explains 25% of the variability in the y-variable.

C. The x-variable explains 50% of the variability in the y-variable.

D. The x-variable explains 50% of the variability in the y-variable.