What is a system of grounding electrodes interconnected by grounding conductors that are buried in the earth to provide lower resistance?

The correct choice is grounded in the purpose and configuration of a ground grid. A ground grid consists of a mesh of grounding electrodes that are interconnected with conductors and typically buried in the earth. This design allows for a large surface area that can be in contact with the soil, which effectively lowers the resistance to ground.

A ground grid serves multiple functions, including providing a stable reference point for electrical systems, facilitating the safe dissipation of fault currents, and reducing the potential for electric shock. By having a grid configuration, the setup allows for better distribution of electrical currents, and if one part of the grid is affected, the integrity of the entire system is generally maintained.

The other options refer to different grounding methods or concepts. For example, a ground loop involves a situation where multiple grounds are connected, creating potential differences and problems with electrical noise, while a ground ring is specifically a circular arrangement of grounding conductors that may serve similar purposes but isn't as extensive as a grid in terms of surface area or resistance benefits. Ground combination is not a commonly recognized term in grounding practices as it does not specify a method generally accepted in electrical standards.