The proton numbers and nucleon numbers for four nuclides are listed as: $^{231}_{88}\text{Ra}$, $^{232}_{90}\text{Th}$, $^{238}_{92}\text{U}$, $^{239}_{94}\text{Pu}$. Which statement is correct?
- APlutonium (Pu) contains one more proton than uranium (U).
- BThorium (Th) contains one more neutron than radium (Ra).
- CThorium (Th) contains one more proton than radium (Ra).
- DUranium (U) contains one more neutron than plutonium (Pu).