Find the Mode(s)for the Given Sample Data $\begin{array}{lll}55 & 56 & 61\end{array}$

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) . $\begin{array}{lll}55 & 56 & 61\end{array}$
$\begin{array}{lll}67 & 58 & 54\end{array}$

A) $59.2$
B) 58
C) No mode
D) $51,65,66,55,56,61,67,58,54$