A lake supplies water to a city. It is observed that the city consumes the same amount of water in the first and second months. The monthly rate of water consumption in the next four months is halved compared to the first two months. It was then observed that the remaining water in the lake is half of the initial original volume. The ratio of the volume of water consumed in the second month to the initial water of the lake is

• A. 1 : 6
• B. 1 : 8
• C. 1 : 12
• D. 1 : 10