Subject: mathqa
Question: a bottle contains a certain solution . in the bottled solution , the ratio of water to soap is 3 : 2 , and the ratio of soap to salt is four times this ratio . the solution is poured into an open container , and after some time , the ratio of water to soap in the open container is quartered by water evaporation . at that time , what is the ratio of water to salt in the solution ?
Option: 
A: 8 : 12
B: 8 : 16
C: 16 : 9
D: 9 : 16
Answer: D