The correct statement that best describes the charges of the particles involved in the nuclear fission reaction is:
A neutral particle is striking a positive particle, breaking it into more neutral and positive particles.
In this scenario, the neutron (which is neutral) is striking the uranium nucleus (which is positively charged due to the protons it contains). This interaction causes the nucleus to undergo fission and release more neutrons (which are also neutral) and other particles, which can include positive particles as well.