Because the world has limited resources, people have to make choices.
Option: B
Step-by-step explanation:
As the resources of world gradually finishing thats why people have to make choices. It is not possible now to provide all the things as per the demands to public. People need to understand the situation and make themselves firm to preserve resources for their future generation so that they do not face scarcity.
Non renewable energy resources are finishing so fast that is fossil fuel the most wanted resource to sustain life. If it fully finish next to the time the generation will also finish. So to prevent that situation people have to make choices in their demands and to take only that thing which is essential.