Answer:
E. the threat of substitute products
Explanation:
A common reason for facing competition is when a company's product has a close substitute.
Substitute products in this case refers to products that can be used in place for another. A popular example is Coca-cola and Pepsi, Tea and coffee. Both of these products could can satisfy the same need. For instance an individual can choose to have Pepsi over Coca-Cola.
This type of threat may affect the company because of compounds that perform the same functions as the company's product.