I would say C. The reason is that A would be assuming too much. You do not know whether or not it's a good plan or a bad plan, so you shouldn't tell him to go get it and find a coupon. That is not advice. B would be accurate also, in the fact that you are not sure if the claims are true or not, and you have not experienced it yourself. But C, is always correct. You should always lose weight with exercise and healthy eating, if you get on a diet plan like this one, you can get unhealthy weight loss that can come back later if you stop eating their food. And the last answer is just silly.
