What does a direct relationship between two variables indicate?

A direct relationship between two variables indicates that both variables change in the same direction. When one variable increases, the other variable also increases, and when one variable decreases, the other variable decreases as well. This means that if you were to graph the two variables, you would see a straight line with a positive slope, reflecting their positive correlation.

In the context of the options provided, a direct relationship is correctly captured by the idea that as one variable decreases, the other also decreases, showing that they are both decreasing together. This relationship is foundational in understanding various scientific phenomena where two quantities are linked together.