preptest 11(June 94) section 2, #11

[amy84]

I understand B is the correct answer. But I don't understand why A is not correct.

I think A also weakens the conclusion. If A is true, then the label "sugar-free" will not do any harm to the consumers who need to lose weight, thus there is no need to ban the labeling.

Is there anything wrong in my thinking? Could anyone help me with it? Thank you!

[WashLaw]

I understand B is the correct answer. But I don't understand why A is not correct.

I think A also weakens the conclusion. If A is true, then the label "sugar-free" will not do any harm to the consumers who need to lose weight, thus there is no need to ban the labeling.

Is there anything wrong in my thinking? Could anyone help me with it? Thank you!

If A is true it strengthens the argument. You are wrong in that A can only occur if the ban is made. In other words, the actions of the food producers would change the product only if there is ban on calling high-calorie items "sugar free".
hth