The correct answer is B) Tripping Palm. The tripping palm of a patent anchor performs the same function as the stock of an old-fashioned anchor, which is to force the flukes to dig into the seafloor. The tripping palm is a protrusion on the shank of the anchor that helps it orient and bury the flukes when the anchor is dropped, similar to how the stock of a traditional anchor helps it set. The other options are incorrect because the shank (A) is the central shaft of the anchor, the bill or pea (C) is the pointed end of the anchor, and the arms (D) are the curved parts that form the flukes, which do not perform the same function as the stock.