Q: Unlike nuclear fission, which involves dangerous radioisotopes, nuclear fusion involves what two harmless elements?


Read this paragraph and choose the correct option from the provided answers:

The use of nuclear fusion for energy has several pros. Unlike nuclear fission, which involves dangerous radioisotopes, nuclear fusion involves hydrogen and helium. These elements are harmless. Hydrogen is also very plentiful. There is a huge amount of hydrogen in ocean water. The hydrogen in just a gallon of water could produce as much energy by nuclear fusion as burning 1,140 liters (300 gallons) of gasoline! The hydrogen in the oceans would generate enough energy to supply all the world’s people for a very long time.

 Choices:

- magnesium and helium

- hydrogen and oxygen

- hydrogen and carbon

- hydrogen and helium


A:
hydrogen and helium