The correct answer is A) a cone shaped bag used to slow down the wind drift effect. A sea anchor is a device used to slow down the drift of a vessel in heavy weather or emergency situations. It works by creating drag in the water, which helps to keep the vessel pointed into the wind and reduces its speed through the water. This can be especially useful for maintaining control and stability in rough seas. The other answer choices are incorrect. B) is incorrect because a pad eye is a fitting used to secure a line, not a sea anchor. C) is incorrect because a heavy anchor with an extra long line is used for anchoring in deep water, not for slowing drift. D) is incorrect because the material used to construct a sea anchor is not relevant to its definition.