Answer
The correct answer is:
(b) an accelerating electric charge
Work Step by Step
An electric charge accelerates as it oscillates, and this acceleration creates a changing electric field. According to Maxwell, a magnetic field is created when there is a changing electric field. This magnetic field is itself changing, which in turn creates a changing electric field. The changing magnetic field and changing electric field can then propagate together as an electromagnetic wave.
The correct answer is:
(b) an accelerating electric charge
