Critical Reasoning (CR) | Re: Many buyers of fashion clothing are inclined to contribute to charitab

While option D is convincing, isn't option C strong contender as well.
My reasoning -
If almost all of the retailers at the event are the ones that donate to charity, then the sales are bound to get divided among all of them. This might not result in an overall increase in the sales.

Isn't the number of sales our major concern according to the conclusion provided here?

Please correct me where ever I am wrong!