ANS:D - Over 30,000 volts

When a person walks across a carpeted or tile floor, electric charge builds up in the body due to the friction between the shoes and floor material. The more you generate this friction static the greater the voltage potential develops in the body.

You start acting as a capacitor. This is called Electrostatic discharge. And If one feels or sees the static shock, it is a minimum of 3000 volts. The potential static charge that can develop from walking on tile floors is greater than 15,000 volts, while carpeted floors can generate in excess of 30,000 volts.