Electricity and magnetism are mutually
A. Complementary
B. Opposite
C. Equal and opposite
D. Strongest forces

Hint: To answer this question, we should have a clear idea about electricity and magnetism as well as the production of them. A combined force of electricity and magnetism is known as Electromagnetism. Magnetism and electricity are closely related but not the same. Magnetism is a force that can help to produce electricity. Meanwhile, electricity can also create magnetic fields.

Complete step by step answer:
Electricity and magnetism are aspects of same phenomenon i.e. Electromagnetism. While both are the aspects of the same force, they are not the same thing. Electricity is produced by electric fields whereas magnetism is produced by magnetic fields. Magnetism is produced due to flowing currents while the electric field is produced due to spinning magnets. When we change the magnetic field, the electric field gets created. Conversely, when we change electric fields, magnetic fields are produced.
Electricity and magnetism are an integral part of the working of nearly every gadget, vehicle, appliance or machine we use. These are fundamental to the working of the modern world.
Hence, electricity and magnetism are mutually complementary to each other.

So, the correct answer is option A i.e. complementary.

Note:
When we pass electricity i.e. electric currents through a metal wire, a magnetic field is produced. But, when we stop the electricity to pass through it, the magnetic fields disappear. There are two types of electricity namely, static electricity and electric currents. Static electricity is caused by the build-up of positive charges at one end and the negative charges at another. While the electric currents are due to movement of electrons. Again the electric currents are divided into two types that are alternating current (AC) and direct current (DC).