A milk vendor has 2 cans of milk .The first contains 75% water and the rest milk. The second contains 50% water. How much milk should he mix from each of the container so as to get 12 litres of milk such that the ratio of water to milk is 3:5?

A.

6 litres

B.

1 litres

C.

8 litres

D.

7 litres