Concept:Napier's bones is a manual calculating device invented to help with multiplication and division.Explanation:The device was created by John Napier of Merchiston, a Scottish mathematician.It consists of numbered rods, called bones, used to simplify calculations.It is based on an ancient method known as lattice or gelosia multiplication.John Napier is therefore the correct inventor of Napier's Bones.Answer:A. John Napier