The origin of the suspensory ligament is at the upper end of which bone?

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The suspensory ligament starts from the palmar (caudal) side of the cannon bone, at its proximal end near the carpus, and runs down the back of the limb to split around the proximal sesamoid bones, with attachments that help support the fetlock and proximal phalanx. The coffin bone (distal phalanx) is further down the limb and is not the origin of this ligament. None of the other listed bones are where it originates either; the key idea is that the origin is on the cannon bone, not the pastern, coffin, or sesamoids. If you had to match to one of the options by proximity, the splint bones are the nearby structures, but the true origin to memorize is the cannon bone.