Which of the Following Statements Presents Accurate Information About the Standard

Which of the following statements presents accurate information about the Standard Oil merger?

A) The Standard Oil merger is an example of a vertical merger.
B) Standard Oil was initially organized as a holding company.
C) The petroleum refining industry was never particularly competitive, and was dominated by a few large firms even prior to the Standard Oil merger.
D) Following the merger, Standard Oil controlled 90 percent of U.S. refining capacity.
E) All of the above.