Final answer:
Deliberately chosen means the use of copper wire for its low resistance was an intentional decision based on its optimal properties for electrical conductivity, despite other materials like silver having even lower resistivity.
Step-by-step explanation:
The phrase deliberately chosen means that the selection of copper wire, with its very low resistance, was made intentionally and with a specific purpose in mind. This intentional choice was due to the fact that copper not only has one of the lowest electrical resistivities among common conductors but also possesses additional beneficial properties such as high tensile strength and high ductility. While silver conducts electricity even better, its high cost makes copper the more practical choice for electrical wiring. Other materials, like aluminum, can also be used for wiring, but each material comes with its own set of advantages and disadvantages.