Find the Mode(s)for the Given Sample Data $\begin{array}{lll}56 & 61 & 60\end{array}$

Multiple Choice

Find the mode(s) for the given sample data.
-Last year, nine employees of an electronics company retired. Their ages at retirement are listed below. Find the mode(s) .
$\begin{array}{lll}56 & 61 & 60\end{array}$
$\begin{array}{lll}57 & 52 & 63\end{array}$
$\begin{array}{lll}64 & 58 & 55\end{array}$

A) $56,61,60,57,52,63,64,58,55$
B) 58
C) $58.4$
D) No mode