Researchers predict that if pisa scores in the united states rose by 25 points, the result could mean an increase of in the nation's gross domestic product over an 80-year time span.

the correct answer is "nuclear power plants do not pollute the air". unlike fossil fuel-fired power plants, nuclear power plants do not produce chemicals or other components that could pollute the air. nuclear reactors work with uranium, creating energy by splitting the atoms in a fission chain reaction, which not results in the formation of carbon dioxide or other greenhouse gases.

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d) social security number

let me know if i am correct or not, so i can edit the answer.