Vertical disintegration occurs when:

A、a company decides to exit industries to its core industry.;
B、a company takes advantage of another company it does business with after the other company has made an substantial investment in assets to meet the needs of the company.;
C、a company decides to acquire its suppliers and distributors.;
D、a company uses its capital resources to purchase its competitor.;
E、a company decides to sell its business model to another company.