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scientists around the world have been working for decades on perfecting the process of nuclear fusion in the lab. which statement justifies this research?

a. scientists are looking for a way to generate an unlimited source of hydrogen.
b. scientists are looking for a way to absorb the energy produced by nuclear bombs.
c. scientists are looking for a way to produce the uncommon noble gas helium.
d. scientists are looking for a way to create cheap, safe, and sustainable energy.