Radioactivity: the Stability of Sc with Respect to Alpha

Radioactivity: The stability of Sc with respect to alpha, β⁺, and β^- decay is to be determined. Do not consider the possibility of decay by electron capture. The following atomic masses are known: He: 4.002603 u K: 42.960717 u Ca: 46.954543 u Sc 46.952409 u Ti: 46.951764 u The Sc nuclide is

A) not subject to alpha, β⁺, or β^- decay.
B) subject to alpha decay only.
C) subject to β⁺ decay only.
D) subject to β^- decay only.
E) subject to β⁺ or β^- decay, but not to alpha decay.