Answer:
B. Better ways to recycle plastics
Step-by-step explanation:
Remember that chemistry studies matter and energy as well as the interactions between them. This means it studies the changes that material substances undergo, how and why substances combine or separate to form another ones. In this case the action of recycling implies a chemical change as the plastic transform not only in a physical way but in a structural one.
This is the reason a chemistry would probaly studie the most efficient way to do it, this means, the way it needs less energy to change.