GMATNinjaHello Experts,
I have a doubt on option C here. Per my understanding, the conclusion states that - Dirt and Oil, rather than changes in the material properties of the string cause them to go dead.
Here my pre thinking is :
1) Assumption: Nothing else apart from dirt and oil can cause the string to go dead. So, intense use of strings is not the reason.
2) To evaluate: we can test whether the smearing substances can cause new strings to see if they go bad.
Doubt (Option c) - I understand why E is correct. But if I apply the variance test on C. It does weaken the argument but not strengthen it.
If I apply variance test on C - Determining whether identical lengths of string, of the same gauge, go dead at different rates when strung on various brands of guitars
Yes - may weaken the conclusion because if the string go bad at different rates, then there might be other reasons that may be causing the strings to go bad and not dirt or oil.
No - It doesn't tell us anything about whether dirt or oil is causing the strings to go bad.
So my analysis is that C only weaken the conclusion and not strengthen, so for that reason, its not correct.
Is my reasoning above correct? Thanks for your help!