Correlation

In one class, the correlation between the final and the midterm was 0.5, whereas the correlation between the final and the homework grades was 0.25. This means that:
A. the relation of the final and the midterm was twice as linear as the relation between the final and the homework.
B. the relation of the final and the homework was twice as linear as the relation between the final and the midterm.
C. More of the variation of the final was explained by the homework grades than by the midterm grades.
D. More of the variation of the final was explained by the midterm grades than by the homework grades.