Dr Samways Is Interested in the Relationship Between Education Level

Dr. Samways is interested in the relationship between education level and annual income. He randomly selects 5000 Canadians and collects information about their highest completed education and last year's income. He then calculates a correlation coefficient, and finds that the correlation between education and income is +.78. On the basis of this correlation we can conclude that

A) there is no relationship between education and income.
B) as education increase income also increases AND higher education causes higher income.
C) as education increases income decreases.
D) as education increases income also increases.
E) higher education causes higher income.