The quotation by Mahatma Gandhi, "You must be the change you wish to see in the world," conveys the idea that if we want to see positive change in the world, we need to start by making positive changes within ourselves. Therefore, the correct interpretation is:
D. If we want the world to be a better place, then we should first work on making positive changes in our own lives.
This option aligns with the message of personal responsibility and individual action to bring about the desired change.