سوال ۲ کنکور ارشد علوم کامپیوتر ۱۴۰۴

The sentence contrasts a "dangerous problem" with a "safe byproduct of carbon-free power." The thing produced by nuclear power generation that is popularly feared as dangerous yet is being reframed as a manageable byproduct is nuclear waste.

• missile / arsenal belong to the domain of nuclear weapons, not a byproduct of power generation.
• conflict does not collocate as a "byproduct of power."
• waste is precisely the leftover material from nuclear reactors, the natural referent of "byproduct."

So the correct word is waste (option 4).

Exam trick: Let the second half of the sentence define the blank — "a safe byproduct of carbon-free power" can only describe nuclear waste.