We can clearly boil the options to C and E.
Now Negation test comes into picture.
C: Sales of products WILL be affected by the way those are sold. = OK if it increases Conclusion stands, If it decreases conclusion falls apart. So this does not have an affective stand over whether we can assume it. So its WRONG.
E:Demand for rear–view mirrors WILL decline by as much as sales of side-view mirrors will increase: SO there won't be any profits the sales of one will decrease while one will increase
...
Now Negation test comes into picture.
C: Sales of products WILL be affected by the way those are sold. = OK if it increases Conclusion stands, If it decreases conclusion falls apart. So this does not have an affective stand over whether we can assume it. So its WRONG.
E:Demand for rear–view mirrors WILL decline by as much as sales of side-view mirrors will increase: SO there won't be any profits the sales of one will decrease while one will increase
...
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