Which of the Following Is a Defining Feature of Firms

Which of the following is a defining feature of firms that practice related-constrained diversification?

A) They earn more than 70 percent of their revenues from their main line of business and the rest from businesses located along the value chain.
B) They earn less than 70 percent of their revenues from their main line of business and their other lines of business share product, technological, and distribution linkages with the main business.
C) They operate in related markets, but fewer linkages exist between the new and existing markets than the elements create separately.
D) They earn more than 95 percent of the revenues from a single line of business.