I struggled between B and D.
The other 3 are obviously wrong. So let me focus on B and D.
Both B and D states something based on the conditions/premises that are beyond what the question provides. Let's check:
B) It has been proven that pet products with recommendations made by veterinarians printed on their packaging sell far more successfully than those that do not have such recommendations printed on their packaging --- To make this work, we will have to assume that there is a connection
...
The other 3 are obviously wrong. So let me focus on B and D.
Both B and D states something based on the conditions/premises that are beyond what the question provides. Let's check:
B) It has been proven that pet products with recommendations made by veterinarians printed on their packaging sell far more successfully than those that do not have such recommendations printed on their packaging --- To make this work, we will have to assume that there is a connection
...
