Ans: D
Since $A$ is translated to the right by $9$ units to $B$, then the coordinates of $B$ are $(4, -2)$.
Since $A$ is translated to the right by $9$ units to $B$, then the coordinates of $B$ are $(4, -2)$.
Since $B$ is rotated anticlockwise about the origin through $90^\circ$ to $C$, then the coordinates of $C$ are $(2, 4)$.
Hence, the $y$-coordinate of $C$ is $4$.
