In progressive die (for sheet metal), spring loaded stripper plate is used to clamp the stock until

The punch penetrates twice the stock thickness

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It removes wrinkles on the product edges

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Automatic feeder plate releases it

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Punch is completely withdrawn from the stock

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Solution

The correct option is D Punch is completely withdrawn from the stock
Stripper plate is used to clamp the stock to avoid the sticking of part with a punch which can make its removal difficult. It also helps prevent the part from distorting and allows the cutting punches to withdraw or "strip" the metal part during the return from stroke.

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