What type of electrical component allows multiple connections for power supply?

The correct choice is a duplex receptacle, which is a type of electrical outlet that accommodates two plugs at once, allowing multiple connections for power supply. This design is particularly useful in settings where several devices might need to be powered simultaneously, such as in homes, offices, and workshops. Duplex receptacles are commonly utilized in residential wiring, providing both convenience and accessibility for plugging in electrical devices.

In contrast, an ear tagger is a tool used in agriculture for marking animals for identification, and is not related to electrical components. An electrical multimeter is an instrument that measures voltage, current, and resistance in electrical circuits, but it does not facilitate power supply connections. An eye bolt is a mechanical fastener used to create a loop for lifting or securing objects, and it has no connection to electrical power supply needs.