____ occurred when financiers bought up several producers of the same product, giving the new owners a large share of the total production of goods, enabling them to set market prices, while _____ took that process further by uniting the producers of product inputs with the product manufacturer in a single corporate structure.
A. Economies of scale ; Fordism
B. Fordism; Economies of scale
C. Horizontal integration; vertical integration
D. Vertical integration; horizontal integration