Whether Supplier-Seller Relationships in an Industry Represent a Strong or Weak

Whether supplier-seller relationships in an industry represent a strong or weak source of competitive pressure is a function of

A) whether the profits of suppliers are relatively high or low.
B) the number of suppliers that each seller/industry member purchases from on average.
C) how aggressively rival industry members are trying to differentiate their products.
D) whether suppliers can exercise sufficient bargaining power to influence the terms and conditions of supply in their favor and the extent of seller-supplier collaboration in the industry.
E) whether the prices of the items being furnished by the suppliers are rising or falling.