Answer B is correct because it provides a study in which the effects are misleading based on what we know. The question tells us that the effectiveness of a weed killer is based on which molecules are more present in concentration in the soil. Answer B is providing that the data is based on equal concentrations in soil which is misleading. Thus Answer B supports the conclusion.

@Disney I turned it into a RRE. Take the conclusion and negate it to become for most peole the generally more expensive training is warrented. C is the only one that answers that. It is giving a benefit of Long term training.

A weakens the conclusion because if the patient knows the got treatment then the conclusion is countered as Group 1 might have not had pain reduction from the magnets but instead just from them knowing of getting a treatment- so in this case there is a alternative to the magnet fields explanation.

I finally get it. E is correct because the abnormalities do not cause the snoring, and when we take that to be true then we support that the snoring will continue.

Now reviewing I see why I got this wrong: The people that thought his performance was pooe are outside of the 52 percent. Those were the people that always supported him. Meanwhile the people that think he's a poor mayor have always that that and continue too. Meaning that is why the numbers are unchanged.