Q: What is one problem with current methods of aluminum production?


Read this paragraph and choose the correct option from the provided answers:

One problem with current methods of aluminum production is the generation of environmental contaminants. Hydrogen fluoride gas is an extremely corrosive and toxic byproduct that must be trapped and neutralized. Other fluorides and metals contaminants can also pollute water, soil, and air if not carefully managed.

 Choices:

- food shortages

- competition

- recycling is cheap

- environmental contaminants


A:
environmental contaminants