A good example of vertical integration is:
A. a global public accounting firm acquiring a small local or regional public accounting firm.
B. a large supermarket chain getting into convenience food stores.
C. a crude oil refiner purchasing a firm engaged in drilling and exploring for oil.
D. a hospital opening up a nursing home for the aged.
E. a railroad company acquiring a trucking company specializing in long-haul freight.
Answer: a crude oil refiner purchasing a firm engaged in drilling and exploring for oil.