1999 Fermat Problem 4

Turning a screwdriver 90^\circ will drive a screw 3 mm deeper into a piece of wood. How many complete revolutions are needed to drive the screw 36 mm into the wood?

\textbf{(A)}\ 3\quad \textbf{(B)}\ 4\quad \textbf{(C)}\ 6\quad \textbf{(D)}\ 9\quad \textbf{(E)}\ 12

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