In the make (insourcing) or buy (outsourcing) type of short-term decision for a product component, the ability of a potential vendor to make timely deliveries of the required component is:

NOTE: Please explain chosen answer

A. an opportunity cost of making the component

B. a qualitative decision factor

C. irrelevant to the decision

D. an unavoidable cost of the decision

E. non an important factor in short-term decisions.