Answered

What is one benefit associated with a nuclear fission reaction?
(1) The products are not radioactive.
(2) Stable isotopes are used as reactants.
(3) There is no chance of biological exposure.
(4) A large amount of energy is produced.



Answer :

"A large amount of energy is produced" is by far the most associated with a nuclear fission reaction in terms of a benefit, in terms of making both power and bombs. 
Blitztiger
The correct answer is (4) A large amount of energy is produced in a nuclear fission reaction.
Choice (1) is false, the products are radioactive, and often have to be buried underground for long periods of time. Choice (2) is false, because the reactants are often unstable to allow them to decay and release energy. Choice (3) is false, because the radioactive substances can affect living organisms.