ChandlerBong
Hi
KarishmaB,
"This will have a negative effect on disposable income for the citizens of Country X, since oil and natural gas, the two available alternative heating fuels, are more expensive than kerosene."(D) Heating costs absorb a very significant portion of the disposable income of citizens of Country X.If we negate D, we get that Heating costs DO NOT absorb ..... Country X.
Now, if they DO NOT absorb a "very significant portion" of the disposable income of citizens, then how can we conclude that it will have a negative effect?
Because if the costs are not hurting the income of citizens, then isn't concluding that it will have a negative effect essentially wrong?
Please share your views on this.
Thanks in advance.

This is the reason they have added the word 'very' before significant.
Negation will be "heating costs are not a very significant portion..."
Well, they could be significant or just a portion. Even if they are in insignificant portion right now because kerosene is cheaper, they could become significant because oil is more expensive.
Even then, in any case, 'a negative effect on disposable income' is a reduction. It doesn't have to be a huge reduction.
Hence, option (D) is incorrect.
When an option in an assumption question tries to quantify something (which is not mentioned in the argument), we know that it shouldn't be an assumption. There could certainly be certain figures such as more than 50% or less than 50% mentioned in an assumption if words such as 'most' or 'majority' are mentioned in the argument.