Which of the Following Is a Drawback of Porter's Five

Multiple Choice

Which of the following is a drawback of Porter's five forces model?

A) The model describes competition narrowly as a firm's closest competitors.
B) Managers cannot determine the changing speed of an industry or the rate of innovation.
C) It fails to provide a basis for deriving implications for a firm's strategic position within an industry.
D) The model fails to consider that threat of substitutes can come from outside a given industry.