Answer:
C
Explanation:
It's not A because you can't use a knife to cut an atom nucleus. Its size is not perceptible to the eye.
It's not B because when two nuclei collide and combine into one, it's call fusion.
It's not D because you can't have stronger forces than the ones holding the nucleus together.
The correct answer is C.
To fission, the nucleus needs to have at least two things: critical mass (only big ones can fission spontaneously) and instability (incorporate a neutron ).
