The correct options are
A Broken plugs and sockets
B Wearing no footwear
C Having wet hands
While handling any electrical equipment, the first thing we should do is to switch the mains off, so any possible fatal electrical hazard can be prevented.
One should wear proper footwear made of wood or rubber while handling electric circuits or equipments, as it won't allow electric current to flow through one's body. Footwears are insulators.
Never touch or approach any open electric circuit or board with wet hands or feet as water is a good conductor of electricity and hence it can lead to a fatal electric shock.
Broken plugs or sockets have more chances of giving you an electric shock as they might have open wires.