Critical Reasoning (CR) | Re: Veterinarians generally derive some of their income

Premise:
1. if mail sent from vet, pet owners rarely through away the mail.
2. use above for marketing their product, manufacturers offered vets a deal.
3. vets rejected it even the offer was lucrative.

paradox - vets rejected the offer even the offer was lucrative.

pre-thinking - something wrong with promotional materials. Though products are of high quality, they may be less in quantity, we need to think something in these lines.

Which of the following, if true, most helps to explain
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