Alloy variations in a nonmagnetic material would most likely affect:

Alloy variations in a nonmagnetic material would most likely affect conductivity. The presence and proportion of different alloying elements can significantly influence the electrical conductivity of a material. These variations can alter the atomic structure and the way electrons move through the metal, impacting its overall ability to conduct electricity.

In nonmagnetic materials, the conductivity is largely determined by the arrangement of atoms and the presence of impurities or alloying elements, which can create barriers to electron flow or enhance it depending on how they interact.

Other factors, such as permeability, diameter, and frequency, may be influenced by alloy variations, but they are not as directly connected to the fundamental electrical properties as conductivity. For instance, while permeability relates to how a material responds to a magnetic field (which is not the primary concern in nonmagnetic materials), the diameter and frequency may pertain more to physical dimensions or electromagnetic wave behavior rather than the inherent electrical properties that conductivity measures.