Answer
$C$
Work Step by Step
The sum of the measures of the interior angles of a quadrilateral is $360^{\circ}$. If three of the angles already measure $90^{\circ}$ each, that would already sum up to $270^{\circ}$. The last angle would have to have a measure of $360^{\circ} - 270^{\circ}$ or $90^{\circ}$.
This means that option $C$ is the correct answer because it is the only option that is not possible.
