A beverage is made by mixing 1 part of water with 3 parts of fruit juice. How many parts of water are mixed with 1 part of fruit juice?
A: 1 over 3.
B: 1 over 2.
C: 3 over 2.
D: 3 over 1.
A: 1 over 3.
B: 1 over 2.
C: 3 over 2.
D: 3 over 1.