Hi
Adit_ Its really a good question, and in the first pass, while analysing the option, we may have eliminated that one, but when we analyse for a few more times, then we can surely say that it is creating a doubt on the conclusion, because the conclusion Listening music causes sleep, whereas watching TV doesnt causes sleep, so a weakner can be Something else is causing sleep rather listening music. For me, A is a good weakner, and I will rate it 9/10, because if it had been too straightforward, then the question would have been too easy.
Other weakner can be that there is a difference in the habits of both groups, any data that says there is no cause and effect but just a correlation. Basically, whatever affects the logical gap or reasoning to arrive at a conclusion, that will be a good weakner.
Hope this helps
Adit_
Been revisiting this problem on and off for a while now and I find this question incredibly hard because of the fact that the stem says:
X does Y before Z. They dont say: they dont do anything else before Z but Y. And upon thorough analysis I also do understand that option A is the best OUT OF the 5 provided and thats all we need. But I have a question here as to how big of a weakener is it on a scale of 1 to 10?
Lets say we had another option that says like:
"Television induces sleep" or something like that (Common weakaners having come across im simply trying to apply by saying if X leads to Y, Y should not cause X as an assumption)
Which one is a stronger weakener and should be the answer here?