Answer
Vertices: $(0,\ 1)$ and $(0, -1)$
Foci: $(0,\sqrt{5})$ and $(0,-\sqrt{5})$.
Matches graph (c).
Work Step by Step
The transverse axis lies on the y-axis.
$a^{2}=1$
$a=1$
The vertices are $a$ units from the center
$(0,\ 1)$ and $(0, -1)$.
The foci are $c$ units from the center.
$b^{2}=4$
$c^{2}=a^{2}+b^{2}=1+4=5$
$c=\sqrt{5}$
Foci: $(0,\sqrt{5})$ and $(0,-\sqrt{5})$.
Matches graph (c).