Jar A has 36 litres of mixture of milk and water in the respective ratio of 5 : 4. Jar B which had 20 litres of mixture of milk and water, was emptied into jar A, and as a result in jar A, the respective ratio of milk and water becomes 5 : 3. What was the quantity of water in jar B?
A)5 litres B)3 litres C)8 litres D)2 litres E)1 litre