A fruit punch is made by mixing grape juice and apple juice in the ratio of 4 to 2. How many glasses of grape juice and apple juice are needed to make 36 glasses of fruit punch?
A. 12 glasses of grape juice, 24 glasses of apple juice
B. 6 glasses of grape juice, 30 glasses of apple juice
C. 24 glasses of grape juice, 12 glasses of apple juice
D. 12 glasses of grape juice, 6 glasses of apple juice