1. Natural gas is considered a nonrenewable resource because


​​​​​​​A. It takes millions of years to form.

​​​​​​​A. It takes millions of years to form.,

​​​​​​​B. It is very expensive to make.

​​​​​​​B. It is very expensive to make.,

​​​​​​​C. It produces pollution when burned.

​​​​​​​C. It produces pollution when burned.,

​​​​​​​D. It cannot be used to generate electricity.