Scandium $\begin{array} { l } 43 \\21\end{array}$ Sc Decays by Emitting a Positron

Scandium $\begin{array} { l } 43 \\21\end{array}$ Sc decays by emitting a positron. What isotope is the product of this decay?

A) $\begin{array} { l } 43 \\21\end{array}$ Sc
B) $\begin{array} { l } 45 \\21\end{array}$ Sc
C) $\begin{array} { l } 44 \\20\end{array}$ Ca
D) $\begin{array} { l } 43 \\21\end{array}$ Ca
E) $\begin{array} { l } 44 \\22\end{array}$ Ti