The mongols underestimated the japanese military which then resulted badly.
I believe that the answer is A, if I am not mistaken!
The nuclear equation that represents the fusion of two H-2 atoms to form He-3 and one neutron is

In a nuclear reaction the nuclides are represented with the chemical symbol preceded by a superscript that represents the mass number (number of protons plus neutrons) and a subscript that represents the atomic number (number of protons).
<h3>What is a Nuclear reaction ?</h3>
A nuclear reaction is a process in nuclear physics and nuclear chemistry where two nuclei or a nucleus and an outside subatomic particle meet to create one or more new nuclides. Consequently, at least one nuclide must change throughout a nuclear reaction.
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The cell contains many nuclei containing DNA, so DNA synthesis and mitosis are taking place, but the cell is not undergoing cytokinesis.