When you walk on a woolen carpet, your body accumulates a static charge. This is commonly known as static electricity. Static electricity occurs when there is an imbalance of electric charges on the surface of an object. In this case, the woolen carpet rubs against your body and transfers some of its electrons to you, leaving both you and the carpet with opposite charges.

When you bring your finger near the metallic handle of a door, something called electrostatic induction takes place. The charged particles in your body, specifically electrons, are attracted to the metallic handle, which is usually a conductor. This attraction causes a flow of electrons from your body to the handle, resulting in an electric shock.

Option 1, "Charge is transferred from your body to the handle," is the correct explanation. The transfer of electric charge from your body to the metallic handle is what causes the electric shock. The transferred charge neutralizes the imbalance, and you feel the shock as a result.

Options 2, 3, and 4 are incorrect and do not explain the phenomenon of electric shock in this scenario. There is no chemical reaction happening, the temperature of the human body is not relevant, and thermal equilibrium is not the process involved in generating the electric shock.