jlam061695 wrote:Can someone explain why D is not a better answer than B? B makes perfect sense to me, and it weakens the argument when negated.
In D (reworded without the "unless"): the shortage of day care is likely to worsen when employment increases and many day-carecenter employees quit to take better-paying jobs in other fields. This is an assumption because if it the shortage was unlikely to worsen even if employment doesn't increase and day-care center employees do not quit their jobs, then it would weaken the argument that it would be harder to find day-care (because it wouldn't be).
Hi jlam,
Careful with the Unless Equation. You have reworded it with the necessary as the sufficient. The word "unless" indicates a necessary condition. So here, "employment increases and many day-care center employees quit to take better-paying jobs in other fields" is the necessary condition, not the sufficient. You take the other part and negate. You did that part correctly. So this would actually turn into:
shortage of day-care likely to worsen
employment increases and many day-care center employees quit to take better paying jobs in other field.
Negating a conditional statement is tricky. You basically negate it as "The necessary condition is not required for the sufficient." Two ways of writing that are "the sufficient could happen even if the necessary doesn't happen" or "if the sufficient happens, the necessary doesn't have to happen." So to negate answer choice (D), you would say that "The shortage of day-care could be likely to worsen, even if employment doesn't increase and day-care employees do not quit to take better paying jobs." That does not kill the argument, so answer choice (D) is not an Assumption of the argument. The argument does not assume that the ONLY way for the day-care shortage to worsen is for those conditions (employment increases & day-care workers quitting) to happen. To come up with a hypothetical, there could be a Baby Boom (increase in births)!
Let's negate answer choice (B). We would negate it to "If the economy grows stronger, the number of new day-care workers COULD be significantly greater than the number of day-care workers who move to better-paying jobs in other fields." That would kill the conclusion that "a stronger economy is likely to make it much more difficult to find day care" because there are new workers to replace the ones that are leaving.
Hope that helps.