You are part of the ground return path in the equipment-grounding system because the floor you are normally standing on or the metal enclosure you may be touching is part of the electrical equipment-grounding system of the building.
Because of this constant contact, you are one side of the circuit (normally referred to as the “grounded return side” of the circuit) at all times.
Electrical shock occurs when you complete a path by touching a live wire (the supply side of the circuit).
Your contact creates an alternate ground-fault path (alternate to the normal load current path) for circuit current.
Share your understanding of this question with the correct explanation.