Based on the text, the factor which is not considered a key supply chain in business processes is:
According to the given question, we are asked to state the factor which is not considered a key supply chain in business processes and how it affects the flow of business.
As a result of this, we can see that in a supply chain, there are various factors which helps the business to flow properly such as the product development and commercialization, supplier relationship management process, and many more which keeps the business flowing properly.
Therefore, the correct answer is option A
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