Thorium-230 is shown by the symbol $^{{230}}_{{90}}\text{Th}$. This isotope is radioactive and transforms into radium by giving off $\alpha$-particles. Which nuclide is formed by this decay?
- A$^{{226}}_{{88}}\text{Ra}$
- B$^{{230}}_{{89}}\text{Ra}$
- C$^{{230}}_{{91}}\text{Ra}$
- D$^{{234}}_{{92}}\text{Ra}$