Radioactivity — practice question

Which nuclide results when thorium-223, $^{{223}}_{{90}}\mathrm{Th}$, emits an alpha-particle?

• A$^{{219}}_{{88}}\mathrm{Ra}$
• B$^{{219}}_{{92}}\mathrm{U}$
• C$^{{227}}_{{88}}\mathrm{Ra}$
• D$^{{227}}_{{92}}\mathrm{U}$