ANSWER
D) 0.6, 0.647, 0.65
Step-by-step explanation
To compare decimals we have to do it the same way we compare whole numbers. We start from the left, if the first numbers are equal for two numbers we move to the second number and compare that. If one of the decimals have one less decimal than the other, we can add zeros to complete and compare.
For example, option A:
In this problem, all of these optoins have the same numbers: 0.6, 0.65 and 0.647. The greatest one is 0.65, then it's 0.647 and the least is 0.6.
From least to greatest this is: 0.6, 0.647, 0.65, which is shown in option D