The Direction the Matrix Won't Turn

Consider the matrix

$A = \begin{bmatrix} 4 & 1 \\ 2 & 3 \end{bmatrix}$

An eigenvector of $A$ is a non-zero vector that $A$ stretches or flips but never turns off its own line: the output $A\mathbf{v}$ is just a scalar copy of the input $\mathbf{v}$.

Exactly one of the four vectors below is an eigenvector of $A$. Which one?