The Rarity of Strategic Alliances

The rarity of strategic alliances

A) depends solely on the number of competing firms that have already implemented an alliance.
B) depends solely on whether or not the benefits that firms obtain from their alliances are not common across firms in the industry.
C) depends not only on the number of competing firms that have already implemented an alliance but also on whether or not the benefits that firms obtain from their alliances are common across competing firms in the industry.
D) depends solely on the number of substitutes available for alliances.