The inflation index in Canada for the year 2008 relative to

The ratio of dollars spent on goods from 2000 to 2008 is 1:4, which is in accordance with the inflation index for each year.
Let the price of model AB-i car = x
For Canada;
In 2000; model AB-i car = 1x
In 2008; model AB-i car = 4x
Difference of 2008 - 2000 = $120
4x - 1x = $120
3x = $120
x = $120/3 = $40
Price of model AB-i car in 2008 = 4x = 4 * 40 = $160

For Australia;
In 2000; model AB-i car = 1x
In 2008; model AB-i car = 5x
Difference: 5x - 1x = $120
4x = $120
x = $120/4 = $30
Price of model AB-i car in 2008 = 5x = 5 * 30 = $150

For Singapore;
In 2000; model AB-i car = 1x
In 2008; model AB-i car = 7x
Difference: 7x - 1x = $120
6x = $120
x = $120/6 = $20
Price of model AB-i car in 2008 = 7x = 7 * 20 = $140

The ratio between the prices of the car in Canada, Australia and Singapore in 2008 are as follow;
$$=\frac{160}{10}:\frac{150}{10}:\frac{140}{10}$$
$$=16:15:14$$

Therefore, the correct answer to this question is option D