The diagram represents a chain of radioactive decays that includes three $\alpha$-particles and one $\beta^-$ particle. $^{237}_{93}\text{Np} \xrightarrow{\alpha} Q \xrightarrow{\beta^-} R \xrightarrow{\alpha} S \xrightarrow{\alpha} T$ Which nuclide is T?
- A$^{225}_{88}\text{Ra}$
- B$^{231}_{88}\text{Ra}$
- C$^{225}_{90}\text{Th}$
- D$^{229}_{90}\text{Th}$