If the nuclear force between two protons,two neutrons,and between a proton and a neutron is denoted by $F_{pp}$,$F_{nn}$,and $F_{pn}$ respectively,then:
- A$F_{pp} < F_{pn} = F_{nn}$
- B$F_{pp} > F_{pn} = F_{nn}$
- C$F_{pp} = F_{pn} = F_{nn}$
- D$F_{pp} < F_{pn} < F_{nn}$
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