If a positive relationship exists between x and y:

A) an increase in x will cause y to decrease.
B) a decrease in x will cause y to increase.
C) the relationship will graph as an upsloping line.
D) the vertical intercept must be positive.

A positive relationship means that as x increases, y also increases. This type of relationship is graphed as an upsloping line. Therefore, the correct option is C. Option A is incorrect because it suggests that increasing x will cause y to decrease, which is contrary to what a positive relationship implies. Option B is also incorrect for the same reason. Option D is irrelevant since the question does not provide information about the vertical intercept.