Question

A) sounds reasonable.

What is one way in which fission differs from fusion?
A) Fission splits nuclei, fusion combines nuclei. ←
B) Fission releases energy, fusion absorbs energy.
C) Fission is not a radioactive process, fusion is radioactive.
D) Fission deals with the nucleus, fusion pertains to the electrons.

Answer 1

A) Fission splits nuclei, fusion combines nuclei

Step-by-step explanation:

Answer 2

Well, to be more correct. A would be the most reasonable. Fission basically splits a large atom into two or more smaller ones, while Fusion is the fusing of two or more lighter atoms into a larger one.

Both Fission and Fusion release and gain energy. Fission reaction is highly radioactive, so that wouldn't make sense. And fusion doesn't pertain to electrons at all.