How did amedeo avogadro contribute to the development of the mole concept?

Chemist George M. Bodner of Purdue University explains. Contrary to the beliefs of generations of chemistry students, Avogadro's number--the number of particles in a unit known as a mole--was not discovered by Amadeo Avogadro (1776-1856).

its c not d   tell me if that´s correct

explanation:

an oligopoly is a term used to clarify the structure of a particular market, industry, or organization. a market is considered oligopolistic or amazingly focused when it is shared between a few companies.