Researchers working on hydrogen fuel cells hope that this could be a(n) ______ innovation, leading to a clean, renewable energy source, and reducing dependence on depleting fossil fuels with their adverse impact on the global environment.

Researchers working on hydrogen fuel cells hope that this could be a(n) ______ innovation, leading to a clean, renewable energy source, and reducing dependence on depleting fossil fuels with their adverse impact on the global environment.



A. incremental

B. product

C. process

D. radical

E. disruptive



Answer: D. radical


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