When an object is moving in a circular path the centripetal force is:

Since centrifugal force acts on an object moving at a constant speed in a circle, it always acts inward because the object's speed is directed towards the circle. This means that the force is always directed perpendicular to the direction of movement of the object.

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a.metals can become magnetic if they have many spinning electrons that create magnetic fields.d.only some metals are attracted by magnets; these metals are called ferromagnetic.

d.wrapping an insulated wire around a metal with ferromagnetic properties and applying an electric current.

your answer is c! hope this : )