Now almost always on any CR question try and pre-think before moving on to answer choices.
This will help you choose the correct answer choice over an incorrect one or atleast give you an edge.
In this question the conclusion is - The campaign didnothing to further Diez economic interest.
This is based on the premise that profits from additional sales were lower than cost of advertising.
Now what can weaken this conclusion.
If it can be shown that even though profits from sale were lower
...
This will help you choose the correct answer choice over an incorrect one or atleast give you an edge.
In this question the conclusion is - The campaign didnothing to further Diez economic interest.
This is based on the premise that profits from additional sales were lower than cost of advertising.
Now what can weaken this conclusion.
If it can be shown that even though profits from sale were lower
...
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