A Changing Current in One Loop of Wire Can Induce

Multiple Choice

A changing current in one loop of wire can induce a current in another loop of wire even though the wires do not touch.The induced current appears almost instantaneously for loops close together.How can this energy exchange happen?

A) This is one of those things for which science has no adequate explanation yet.
B) The second loop is affected by the thermal exchange from the heating of the first loop.
C) It is a gravitational effect on the electrons.
D) It is done via an electromagnetic wave.