I did not select A and my reasoning goes as follows:
If it is true that the people coming to Apex health club have access to better aerobic equipment elsewhere, there is a probability that the people focus more on weight building equipment(may be for people coming after morning hours). If this is the case, then it makes sense that Blown has displayed its advert outside the entrance of the club. Then, it weakens John's argument!
In weaken or strengthen questions, the question stem says "Each
...
If it is true that the people coming to Apex health club have access to better aerobic equipment elsewhere, there is a probability that the people focus more on weight building equipment(may be for people coming after morning hours). If this is the case, then it makes sense that Blown has displayed its advert outside the entrance of the club. Then, it weakens John's argument!
In weaken or strengthen questions, the question stem says "Each
...




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