Nice question!
In my opinion it's a clear C.
The reason is that if this manufacturer sends free promotional material to all this veterinarian's clients, and this material is available in malls and other supermarkets, there is a good chance that the clients don't come back to the vet(for the purchase) and his sales reduce.
Since the vet stocks other manufacturer's products, he/she will be able to sell more products if he/she has exclusive rights to sell the manufacturer's products.
In my opinion it's a clear C.
The reason is that if this manufacturer sends free promotional material to all this veterinarian's clients, and this material is available in malls and other supermarkets, there is a good chance that the clients don't come back to the vet(for the purchase) and his sales reduce.
Since the vet stocks other manufacturer's products, he/she will be able to sell more products if he/she has exclusive rights to sell the manufacturer's products.
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