The figure shows a light rod of length L rigidly attached to a small heavy block at one end and a...

The figure shows a light rod of length L rigidly attached to a small heavy block at one end and a hook at the other end. The system is released from rest with the rod in a horizontal position. There is a fixed smooth ring at a depth h below the initial position of the hook and the hook gets into the ring as it reaches there. What should be the minimum value of h, so that the block moves in a complete circle about the ring?
(a) h=L
(b) h=2 L
(c) h=3 L
(d) h=4 L

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