Which of the Following Is Not One of the Five

Which of the following is not one of the five typical sources of competitive pressures?

A) The power and influence of industry driving forces
B) The bargaining power of suppliers and seller-supplier collaboration
C) The threat of new entrants into the market
D) The attempts of companies in other industries to win customers over to their own substitute products
E) The market maneuvering and jockeying for buyer patronage that goes on among rival sellers in the industry