Which Factors Have a Major Influence on Supply's Level in the Organization

Which factors have a major influence on supply's level in the organization:

A) the credentials of the supply personnel;the geographical location of the supply base;the ratio of purchased material and services costs to total costs or total income.
B) industry sector;the geographical location of the supply base;the ratio of purchased material and services costs to total costs or total income.
C) the extent to which supply and suppliers can provide competitive advantage;the ratio of purchased material and services costs to total costs or total income.
D) the nature of the products or services acquired;the extent to which supply and suppliers can provide competitive advantage;the ratio of purchased material and services costs to total costs or total income.
E) the credentials of the supply personnel;industry sector;the nature of the products or services acquired.