When Taco Bell requires its franchisees to purchase all their raw materials and supplies from the franchisor in order for the franchisor to maintain quality control, it is:
a. engaging in an illegal exclusive distribution agreement.
b. enforcing an illegal tying agreement.
c. employing a dual distribution agreement.
d. violating the franchisee's right to fair trade.
e. enforcing a tying agreement, which courts generally consider legal as long as there is sufficient proof that these arrangements are necessary to maintain quality control.
Answer: E