Which of the Following Is TRUE

Which of the following is TRUE?

A) Much of the research conducted by advertising agencies deals directly with creating the production schedule.
B) Marketing research really began to grow when firms could no longer sell all they could produce.
C) The growth in the number of new marketing research departments has escalated recently.
D) Marketing research is dominated by international,especially European firms,and is has only a minor collection of firms in the United States.
E) All of the above are true.