Pencilpop, a Stationery Store, Has Been Purchasing All Its Paper

Pencilpop, a stationery store, has been purchasing all its paper products from Tigreto, a wholesaler of paper products, for over a decade. Tigreto gives Pencilpop seasonal discounts and sells its products on a credit basis. Pencilpop does not source its paper products from any other wholesaler because of the low price and the consistent quality that Tigreto offers. In the context of the specific environment, which of the following concepts does this scenario best illustrate?

A) Path dependence
B) Supplier dependence
C) Buyer dependence
D) Internal dependence