So the correct answer here was B. According to JY, B is right because the argument requires an assumption: that in order for direct mail advertising to not be bad for the environment, it needs to replace those who would normally buy ...
#help
Whenever we are given [P→C] argument. I tend to see [C→P] as a correct strenthening answer choice. I understand that such answer choices try to a create connection between P and C, but isn’t this a negation flaw?