What do you learn about Salesperson age after performing each of the correlation and regression analyses in the prior questions?

A. A correlation analysis is usually enough to tell you what you need to know

B. Although a correlation by itself may not tell you the whole story, it's at least enough to establish causality

C. Even if a correlation is substantial, you don't know for sure until you measure it in a regression model with several other relevant variables

D. If the correlation is negative, the relationship is not likely to be significant