Which of the Following Is the Best Definition of the Term

Which of the following is the best definition of the term nuclear fission?

A) A nuclear reaction in which two small nuclei combine to form a larger nucleus
B) A nuclear reaction in which a large nucleus splits into two smaller nuclei
C) The combination of a nucleus and an electron to produce an element with an atomic number one less than the original element
D) The combination of a nucleus and a positron to produce an element with an atomic number one more than the original element
E) The ejection of an electron from a nucleus to produce an element with an atomic number one more than the original element