What Is the Size of the Matrix $\left[\begin{array}{llll}3 & -8 & 3 & 7\end{array}\right]$

What is the size of the matrix?
$\left[\begin{array}{llll}3 & -8 & 3 & 7\end{array}\right]$

A) $1 \times 4$
B) $4 \times 1$
C) 1
D) 4