The Correlation Between a Family's Weekly Income and the Amount

Multiple Choice

The correlation between a family's weekly income and the amount they spend on restaurant meals is found to be r = 0.30. Which must be true?
I. Families tend to spend about 30% of their incomes in restaurants.
II. In general, the higher the income, the more the family spends in restaurants.
III. The line of best fit passes through 30% of the (income, restaurant$) data points.

A) II only
B) I only
C) III only
D) II and III only
E) I, II, and III