Question

scientists around the world have been working for decades on perfecting the process of nuclear fusion in the lab. which statement justifies this research?
○ scientists are looking for a way to generate an unlimited source of hydrogen.
○ scientists are looking for a way to absorb the energy produced by nuclear bombs.
○ scientists are looking for a way to produce the uncommon noble gas helium.
○ scientists are looking for a way to create cheap, safe, and sustainable energy.

Explanation:

• Option 1: Nuclear fusion doesn't focus on generating hydrogen; it uses hydrogen isotopes as fuel, so this is incorrect.
• Option 2: Nuclear fusion research isn't about absorbing energy from nuclear bombs (fusion in bombs is uncontrolled, and research is for controlled energy production), so this is wrong.
• Option 3: Producing helium isn't the main goal of nuclear fusion research; the focus is energy, so this is incorrect.
• Option 4: Nuclear fusion has the potential to provide cheap, safe, and sustainable energy (abundant fuel, low waste, no chain reaction risks), so this justifies the research.

Answer:

D. Scientists are looking for a way to create cheap, safe, and sustainable energy (assuming the last option is D; if the options are labeled differently, adjust the identifier, e.g., if last option is A, B, C, D as per original, the correct one is the last option about cheap, safe, sustainable energy).