Which of the Following Examples Best Illustrates the Effect of Informal

Which of the following examples best illustrates the effect of informal institutions on marketing and supply chain management?

A) Fitchell Corp.communicated new quality regulations to its vendors,which in turn changed the quality standard of the material supplied by the vendors to their domestic companies.
B) Huran Inc.dropped the idea of advertising its products via newspapers in Duador because most of the people in Duador read news on the Internet.
C) Tenoy Inc.once had the most graphic animation in advertisements,but is forced to modify them because such advertisements are not rare anymore.
D) Esca Motors dissolved its contract with a company that was providing with aerodynamic frames for its vehicles because the company was using this as a leverage to compete with Esca Motors.