It's a narcotic
So the answer would be c
In most contemporary models of the earth there is only a finite amount of resources so as populations rise the amount or resources available to each individual shrinks. Studies show us that this informations is not really accurate since less than 2% of the entire human population control use and access to 90% of all material resources on the planet. This unequal distribution makes it nearly impossible to know how many people the earths resources are actual capable of maintaining since most people are denied free access to resources due to laws and regulations that are created my people who already have access to resources and thus can deny access to other. In many ways the concepts of ownership and profit prevent fair distribution of resources.
I think the answer to this would be :
Younger people also need to do warm-ups because their muscles can also get injured.
There is no person in the world where someone's muscles would not get injured if they do not stretch or do warm-ups. It is the way of life that the muscles can be more stiff if no loosened up and this sometimes results in injuries or sprains.
C. Keep materials in unlabeled containers
Did you get any vocabulary to choose from? Or your supposed to fill it in yourself?