What Is the Size of the Matrix $\left[\begin{array}{rrr}5 & 5 & 6 \\ -4 & 2 & 1\end{array}\right]$

What is the size of the matrix?
$\left[\begin{array}{rrr}5 & 5 & 6 \\ -4 & 2 & 1\end{array}\right]$

A) 6
B) $2 \times 3$
C) $3 \times 2$
D) 3