Thank you for the opportunity to help you with your question!
in nuclear fission reaction, a neutron (not proton) gets stroke on the U235 as a result of which it breaks apart and creates new elements. so the best option among all of them is option B"new elements are created when U235 breaks apart.
Please let me know if you need any clarification. I'm always happy to answer your questions.
Jun 9th, 2015
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