What is polygenic inheritance

Polygenic Inheritance is where one trait (for example, eye color) is determined by multiple genes (two or more).

This typically happens when there is a wide variety of this trait (e.g. height, eye color, hair color, skin color, etc.).

the electrical  conductivity  of asolution  of an electrolyte is measured by determining the resistance of thesolution  between two flat or cylindrical electrodes separated by a fixed distance.

i think it's c. i'm not sure but i think so.