The main impact that the changing industry boundaries have had is that there is an increase in the number of competitors within an industry.
Basically, we can define an industry boundaries simply through the products and services they offer. For instance, the airline industry is the only industry that provides air transportation from one place to another and movie theaters show films.
In marketing, the need to understand the definition of industry boundaries is important because its helps the firm to better understand who its competitors are, the firm competitive advantages, disadvantages & those of its competitors, customers & their requirements, suppliers, implications of disruptive technologies and applicable rules for its market.
Therefore, the Option B is correct.
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